Remove the platform-specific definitions of VM_BATCHQUEUE_SIZE for amd64 and powerpc64, and instead treat all 64-bit platforms identically. This has the effect of increasing the arm64 and riscv VM_BATCHQUEUE_SIZE to match that of other platforms. Reviewed by: jhb, markj Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D37707
473 lines
17 KiB
C
473 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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#ifndef _VM_PAGEQUEUE_
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#define _VM_PAGEQUEUE_
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#ifdef _KERNEL
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struct vm_pagequeue {
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struct mtx pq_mutex;
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struct pglist pq_pl;
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int pq_cnt;
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const char * const pq_name;
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uint64_t pq_pdpages;
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} __aligned(CACHE_LINE_SIZE);
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#if __SIZEOF_LONG__ == 8
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#define VM_BATCHQUEUE_SIZE 63
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#else
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#define VM_BATCHQUEUE_SIZE 15
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#endif
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struct vm_batchqueue {
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vm_page_t bq_pa[VM_BATCHQUEUE_SIZE];
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int bq_cnt;
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} __aligned(CACHE_LINE_SIZE);
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#include <vm/uma.h>
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#include <sys/_blockcount.h>
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#include <sys/pidctrl.h>
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struct sysctl_oid;
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/*
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* One vm_domain per NUMA domain. Contains pagequeues, free page structures,
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* and accounting.
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*
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* Lock Key:
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* f vmd_free_mtx
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* p vmd_pageout_mtx
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* d vm_domainset_lock
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* a atomic
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* c const after boot
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* q page queue lock
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*
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* A unique page daemon thread manages each vm_domain structure and is
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* responsible for ensuring that some free memory is available by freeing
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* inactive pages and aging active pages. To decide how many pages to process,
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* it uses thresholds derived from the number of pages in the domain:
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*
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* vmd_page_count
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* ---
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* |
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* |-> vmd_inactive_target (~3%)
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* | - The active queue scan target is given by
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* | (vmd_inactive_target + vmd_free_target - vmd_free_count).
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* |
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* |
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* |-> vmd_free_target (~2%)
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* | - Target for page reclamation.
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* |
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* |-> vmd_pageout_wakeup_thresh (~1.8%)
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* | - Threshold for waking up the page daemon.
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* |
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* |
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* |-> vmd_free_min (~0.5%)
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* | - First low memory threshold.
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* | - Causes per-CPU caching to be lazily disabled in UMA.
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* | - vm_wait() sleeps below this threshold.
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* |
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* |-> vmd_free_severe (~0.25%)
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* | - Second low memory threshold.
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* | - Triggers aggressive UMA reclamation, disables delayed buffer
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* | writes.
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* |
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* |-> vmd_free_reserved (~0.13%)
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* | - Minimum for VM_ALLOC_NORMAL page allocations.
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* |-> vmd_pageout_free_min (32 + 2 pages)
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* | - Minimum for waking a page daemon thread sleeping in vm_wait().
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* |-> vmd_interrupt_free_min (2 pages)
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* | - Minimum for VM_ALLOC_SYSTEM page allocations.
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* ---
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*
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*--
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* Free page count regulation:
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*
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* The page daemon attempts to ensure that the free page count is above the free
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* target. It wakes up periodically (every 100ms) to input the current free
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* page shortage (free_target - free_count) to a PID controller, which in
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* response outputs the number of pages to attempt to reclaim. The shortage's
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* current magnitude, rate of change, and cumulative value are together used to
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* determine the controller's output. The page daemon target thus adapts
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* dynamically to the system's demand for free pages, resulting in less
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* burstiness than a simple hysteresis loop.
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*
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* When the free page count drops below the wakeup threshold,
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* vm_domain_allocate() proactively wakes up the page daemon. This helps ensure
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* that the system responds promptly to a large instantaneous free page
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* shortage.
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*
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* The page daemon also attempts to ensure that some fraction of the system's
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* memory is present in the inactive (I) and laundry (L) page queues, so that it
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* can respond promptly to a sudden free page shortage. In particular, the page
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* daemon thread aggressively scans active pages so long as the following
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* condition holds:
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*
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* len(I) + len(L) + free_target - free_count < inactive_target
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*
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* Otherwise, when the inactive target is met, the page daemon periodically
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* scans a small portion of the active queue in order to maintain up-to-date
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* per-page access history. Unreferenced pages in the active queue thus
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* eventually migrate to the inactive queue.
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*
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* The per-domain laundry thread periodically launders dirty pages based on the
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* number of clean pages freed by the page daemon since the last laundering. If
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* the page daemon fails to meet its scan target (i.e., the PID controller
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* output) because of a shortage of clean inactive pages, the laundry thread
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* attempts to launder enough pages to meet the free page target.
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*
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*--
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* Page allocation priorities:
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*
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* The system defines three page allocation priorities: VM_ALLOC_NORMAL,
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* VM_ALLOC_SYSTEM and VM_ALLOC_INTERRUPT. An interrupt-priority allocation can
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* claim any free page. This priority is used in the pmap layer when attempting
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* to allocate a page for the kernel page tables; in such cases an allocation
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* failure will usually result in a kernel panic. The system priority is used
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* for most other kernel memory allocations, for instance by UMA's slab
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* allocator or the buffer cache. Such allocations will fail if the free count
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* is below interrupt_free_min. All other allocations occur at the normal
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* priority, which is typically used for allocation of user pages, for instance
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* in the page fault handler or when allocating page table pages or pv_entry
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* structures for user pmaps. Such allocations fail if the free count is below
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* the free_reserved threshold.
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*
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*--
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* Free memory shortages:
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*
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* The system uses the free_min and free_severe thresholds to apply
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* back-pressure and give the page daemon a chance to recover. When a page
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* allocation fails due to a shortage and the allocating thread cannot handle
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* failure, it may call vm_wait() to sleep until free pages are available.
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* vm_domain_freecnt_inc() wakes sleeping threads once the free page count rises
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* above the free_min threshold; the page daemon and laundry threads are given
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* priority and will wake up once free_count reaches the (much smaller)
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* pageout_free_min threshold.
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*
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* On NUMA systems, the domainset iterators always prefer NUMA domains where the
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* free page count is above the free_min threshold. This means that given the
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* choice between two NUMA domains, one above the free_min threshold and one
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* below, the former will be used to satisfy the allocation request regardless
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* of the domain selection policy.
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*
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* In addition to reclaiming memory from the page queues, the vm_lowmem event
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* fires every ten seconds so long as the system is under memory pressure (i.e.,
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* vmd_free_count < vmd_free_target). This allows kernel subsystems to register
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* for notifications of free page shortages, upon which they may shrink their
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* caches. Following a vm_lowmem event, UMA's caches are pruned to ensure that
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* they do not contain an excess of unused memory. When a domain is below the
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* free_min threshold, UMA limits the population of per-CPU caches. When a
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* domain falls below the free_severe threshold, UMA's caches are completely
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* drained.
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*
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* If the system encounters a global memory shortage, it may resort to the
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* out-of-memory (OOM) killer, which selects a process and delivers SIGKILL in a
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* last-ditch attempt to free up some pages. Either of the two following
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* conditions will activate the OOM killer:
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*
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* 1. The page daemons collectively fail to reclaim any pages during their
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* inactive queue scans. After vm_pageout_oom_seq consecutive scans fail,
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* the page daemon thread votes for an OOM kill, and an OOM kill is
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* triggered when all page daemons have voted. This heuristic is strict and
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* may fail to trigger even when the system is effectively deadlocked.
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*
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* 2. Threads in the user fault handler are repeatedly unable to make progress
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* while allocating a page to satisfy the fault. After
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* vm_pfault_oom_attempts page allocation failures with intervening
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* vm_wait() calls, the faulting thread will trigger an OOM kill.
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*/
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struct vm_domain {
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struct vm_pagequeue vmd_pagequeues[PQ_COUNT];
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struct mtx_padalign vmd_free_mtx;
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struct mtx_padalign vmd_pageout_mtx;
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struct vm_pgcache {
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int domain;
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int pool;
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uma_zone_t zone;
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} vmd_pgcache[VM_NFREEPOOL];
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struct vmem *vmd_kernel_arena; /* (c) per-domain kva R/W arena. */
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struct vmem *vmd_kernel_rwx_arena; /* (c) per-domain kva R/W/X arena. */
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u_int vmd_domain; /* (c) Domain number. */
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u_int vmd_page_count; /* (c) Total page count. */
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long vmd_segs; /* (c) bitmask of the segments */
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u_int __aligned(CACHE_LINE_SIZE) vmd_free_count; /* (a,f) free page count */
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u_int vmd_pageout_deficit; /* (a) Estimated number of pages deficit */
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uint8_t vmd_pad[CACHE_LINE_SIZE - (sizeof(u_int) * 2)];
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/* Paging control variables, used within single threaded page daemon. */
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struct pidctrl vmd_pid; /* Pageout controller. */
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boolean_t vmd_oom;
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u_int vmd_inactive_threads;
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u_int vmd_inactive_shortage; /* Per-thread shortage. */
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blockcount_t vmd_inactive_running; /* Number of inactive threads. */
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blockcount_t vmd_inactive_starting; /* Number of threads started. */
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volatile u_int vmd_addl_shortage; /* Shortage accumulator. */
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volatile u_int vmd_inactive_freed; /* Successful inactive frees. */
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volatile u_int vmd_inactive_us; /* Microseconds for above. */
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u_int vmd_inactive_pps; /* Exponential decay frees/second. */
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int vmd_oom_seq;
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int vmd_last_active_scan;
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struct vm_page vmd_markers[PQ_COUNT]; /* (q) markers for queue scans */
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struct vm_page vmd_inacthead; /* marker for LRU-defeating insertions */
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struct vm_page vmd_clock[2]; /* markers for active queue scan */
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int vmd_pageout_wanted; /* (a, p) pageout daemon wait channel */
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int vmd_pageout_pages_needed; /* (d) page daemon waiting for pages? */
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bool vmd_minset; /* (d) Are we in vm_min_domains? */
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bool vmd_severeset; /* (d) Are we in vm_severe_domains? */
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enum {
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VM_LAUNDRY_IDLE = 0,
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VM_LAUNDRY_BACKGROUND,
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VM_LAUNDRY_SHORTFALL
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} vmd_laundry_request;
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/* Paging thresholds and targets. */
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u_int vmd_clean_pages_freed; /* (q) accumulator for laundry thread */
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u_int vmd_background_launder_target; /* (c) */
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u_int vmd_free_reserved; /* (c) pages reserved for deadlock */
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u_int vmd_free_target; /* (c) pages desired free */
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u_int vmd_free_min; /* (c) pages desired free */
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u_int vmd_inactive_target; /* (c) pages desired inactive */
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u_int vmd_pageout_free_min; /* (c) min pages reserved for kernel */
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u_int vmd_pageout_wakeup_thresh;/* (c) min pages to wake pagedaemon */
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u_int vmd_interrupt_free_min; /* (c) reserved pages for int code */
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u_int vmd_free_severe; /* (c) severe page depletion point */
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/* Name for sysctl etc. */
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struct sysctl_oid *vmd_oid;
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char vmd_name[sizeof(__XSTRING(MAXMEMDOM))];
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} __aligned(CACHE_LINE_SIZE);
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extern struct vm_domain vm_dom[MAXMEMDOM];
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#define VM_DOMAIN(n) (&vm_dom[(n)])
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#define VM_DOMAIN_EMPTY(n) (vm_dom[(n)].vmd_page_count == 0)
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#define vm_pagequeue_assert_locked(pq) mtx_assert(&(pq)->pq_mutex, MA_OWNED)
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#define vm_pagequeue_lock(pq) mtx_lock(&(pq)->pq_mutex)
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#define vm_pagequeue_lockptr(pq) (&(pq)->pq_mutex)
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#define vm_pagequeue_trylock(pq) mtx_trylock(&(pq)->pq_mutex)
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#define vm_pagequeue_unlock(pq) mtx_unlock(&(pq)->pq_mutex)
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#define vm_domain_free_assert_locked(n) \
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mtx_assert(vm_domain_free_lockptr((n)), MA_OWNED)
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#define vm_domain_free_assert_unlocked(n) \
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mtx_assert(vm_domain_free_lockptr((n)), MA_NOTOWNED)
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#define vm_domain_free_lock(d) \
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mtx_lock(vm_domain_free_lockptr((d)))
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#define vm_domain_free_lockptr(d) \
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(&(d)->vmd_free_mtx)
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#define vm_domain_free_trylock(d) \
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mtx_trylock(vm_domain_free_lockptr((d)))
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#define vm_domain_free_unlock(d) \
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mtx_unlock(vm_domain_free_lockptr((d)))
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#define vm_domain_pageout_lockptr(d) \
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(&(d)->vmd_pageout_mtx)
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#define vm_domain_pageout_assert_locked(n) \
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mtx_assert(vm_domain_pageout_lockptr((n)), MA_OWNED)
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#define vm_domain_pageout_assert_unlocked(n) \
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mtx_assert(vm_domain_pageout_lockptr((n)), MA_NOTOWNED)
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#define vm_domain_pageout_lock(d) \
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mtx_lock(vm_domain_pageout_lockptr((d)))
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#define vm_domain_pageout_unlock(d) \
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mtx_unlock(vm_domain_pageout_lockptr((d)))
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static __inline void
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vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend)
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{
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vm_pagequeue_assert_locked(pq);
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pq->pq_cnt += addend;
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}
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#define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1)
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#define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1)
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static inline void
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vm_pagequeue_remove(struct vm_pagequeue *pq, vm_page_t m)
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{
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TAILQ_REMOVE(&pq->pq_pl, m, plinks.q);
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vm_pagequeue_cnt_dec(pq);
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}
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static inline void
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vm_batchqueue_init(struct vm_batchqueue *bq)
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{
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bq->bq_cnt = 0;
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}
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static inline int
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vm_batchqueue_insert(struct vm_batchqueue *bq, vm_page_t m)
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{
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int slots_free;
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slots_free = nitems(bq->bq_pa) - bq->bq_cnt;
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if (slots_free > 0) {
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bq->bq_pa[bq->bq_cnt++] = m;
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return (slots_free);
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}
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return (slots_free);
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}
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static inline vm_page_t
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vm_batchqueue_pop(struct vm_batchqueue *bq)
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{
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if (bq->bq_cnt == 0)
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return (NULL);
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return (bq->bq_pa[--bq->bq_cnt]);
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}
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void vm_domain_set(struct vm_domain *vmd);
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void vm_domain_clear(struct vm_domain *vmd);
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int vm_domain_allocate(struct vm_domain *vmd, int req, int npages);
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/*
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* vm_pagequeue_domain:
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*
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* Return the memory domain the page belongs to.
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*/
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static inline struct vm_domain *
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vm_pagequeue_domain(vm_page_t m)
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{
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return (VM_DOMAIN(vm_page_domain(m)));
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}
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/*
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* Return the number of pages we need to free-up or cache
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* A positive number indicates that we do not have enough free pages.
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*/
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static inline int
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vm_paging_target(struct vm_domain *vmd)
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{
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return (vmd->vmd_free_target - vmd->vmd_free_count);
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}
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/*
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* Returns TRUE if the pagedaemon needs to be woken up.
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*/
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static inline int
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vm_paging_needed(struct vm_domain *vmd, u_int free_count)
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{
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return (free_count < vmd->vmd_pageout_wakeup_thresh);
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}
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/*
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* Returns TRUE if the domain is below the min paging target.
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*/
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static inline int
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vm_paging_min(struct vm_domain *vmd)
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{
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return (vmd->vmd_free_min > vmd->vmd_free_count);
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}
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/*
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* Returns TRUE if the domain is below the severe paging target.
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*/
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static inline int
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vm_paging_severe(struct vm_domain *vmd)
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{
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return (vmd->vmd_free_severe > vmd->vmd_free_count);
|
|
}
|
|
|
|
/*
|
|
* Return the number of pages we need to launder.
|
|
* A positive number indicates that we have a shortfall of clean pages.
|
|
*/
|
|
static inline int
|
|
vm_laundry_target(struct vm_domain *vmd)
|
|
{
|
|
|
|
return (vm_paging_target(vmd));
|
|
}
|
|
|
|
void pagedaemon_wakeup(int domain);
|
|
|
|
static inline void
|
|
vm_domain_freecnt_inc(struct vm_domain *vmd, int adj)
|
|
{
|
|
u_int old, new;
|
|
|
|
old = atomic_fetchadd_int(&vmd->vmd_free_count, adj);
|
|
new = old + adj;
|
|
/*
|
|
* Only update bitsets on transitions. Notice we short-circuit the
|
|
* rest of the checks if we're above min already.
|
|
*/
|
|
if (old < vmd->vmd_free_min && (new >= vmd->vmd_free_min ||
|
|
(old < vmd->vmd_free_severe && new >= vmd->vmd_free_severe) ||
|
|
(old < vmd->vmd_pageout_free_min &&
|
|
new >= vmd->vmd_pageout_free_min)))
|
|
vm_domain_clear(vmd);
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGEQUEUE_ */
|