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freebsd-dev/sys/vm/vm_pagequeue.h
Mark Johnston 8b90607f20 Simplify vm_page_dequeue() and fix an assertion. 
- Add a vm_pagequeue_remove() function to physically remove a page
  from its queue and update the queue length.
- Remove vm_page_pagequeue_lockptr() and let vm_page_pagequeue()
  return NULL for dequeued pages.
- Avoid unnecessarily reloading the queue index if vm_page_dequeue()
  loses a race with a concurrent queue operation.
- Correct an always-true assertion: vm_page_dequeue() may be called
  from the page allocator with the page unlocked.  The assertion
  m->order == VM_NFREEORDER simply tests whether the page has been
  removed from the vm_phys free lists; instead, check whether the
  page belongs to an object.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D21341
2019-08-21 16:11:12 +00:00

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/*-
* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* All rights reserved.
*
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $FreeBSD$
*/
#ifndef _VM_PAGEQUEUE_
#define _VM_PAGEQUEUE_
#ifdef _KERNEL
struct vm_pagequeue {
struct mtx pq_mutex;
struct pglist pq_pl;
int pq_cnt;
const char * const pq_name;
uint64_t pq_pdpages;
} __aligned(CACHE_LINE_SIZE);
#ifndef VM_BATCHQUEUE_SIZE
#define VM_BATCHQUEUE_SIZE 7
#endif
struct vm_batchqueue {
vm_page_t bq_pa[VM_BATCHQUEUE_SIZE];
int bq_cnt;
} __aligned(CACHE_LINE_SIZE);
#include <vm/uma.h>
#include <sys/pidctrl.h>
struct sysctl_oid;
/*
* One vm_domain per-numa domain. Contains pagequeues, free page structures,
* and accounting.
*
* Lock Key:
* f vmd_free_mtx
* p vmd_pageout_mtx
* d vm_domainset_lock
* a atomic
* c const after boot
* q page queue lock
*/
struct vm_domain {
struct vm_pagequeue vmd_pagequeues[PQ_COUNT];
struct mtx_padalign vmd_free_mtx;
struct mtx_padalign vmd_pageout_mtx;
struct vm_pgcache {
int domain;
int pool;
uma_zone_t zone;
} vmd_pgcache[VM_NFREEPOOL];
struct vmem *vmd_kernel_arena; /* (c) per-domain kva R/W arena. */
struct vmem *vmd_kernel_rwx_arena; /* (c) per-domain kva R/W/X arena. */
u_int vmd_domain; /* (c) Domain number. */
u_int vmd_page_count; /* (c) Total page count. */
long vmd_segs; /* (c) bitmask of the segments */
u_int __aligned(CACHE_LINE_SIZE) vmd_free_count; /* (a,f) free page count */
u_int vmd_pageout_deficit; /* (a) Estimated number of pages deficit */
uint8_t vmd_pad[CACHE_LINE_SIZE - (sizeof(u_int) * 2)];
/* Paging control variables, used within single threaded page daemon. */
struct pidctrl vmd_pid; /* Pageout controller. */
boolean_t vmd_oom;
int vmd_oom_seq;
int vmd_last_active_scan;
struct vm_page vmd_markers[PQ_COUNT]; /* (q) markers for queue scans */
struct vm_page vmd_inacthead; /* marker for LRU-defeating insertions */
struct vm_page vmd_clock[2]; /* markers for active queue scan */
int vmd_pageout_wanted; /* (a, p) pageout daemon wait channel */
int vmd_pageout_pages_needed; /* (d) page daemon waiting for pages? */
bool vmd_minset; /* (d) Are we in vm_min_domains? */
bool vmd_severeset; /* (d) Are we in vm_severe_domains? */
enum {
VM_LAUNDRY_IDLE = 0,
VM_LAUNDRY_BACKGROUND,
VM_LAUNDRY_SHORTFALL
} vmd_laundry_request;
/* Paging thresholds and targets. */
u_int vmd_clean_pages_freed; /* (q) accumulator for laundry thread */
u_int vmd_background_launder_target; /* (c) */
u_int vmd_free_reserved; /* (c) pages reserved for deadlock */
u_int vmd_free_target; /* (c) pages desired free */
u_int vmd_free_min; /* (c) pages desired free */
u_int vmd_inactive_target; /* (c) pages desired inactive */
u_int vmd_pageout_free_min; /* (c) min pages reserved for kernel */
u_int vmd_pageout_wakeup_thresh;/* (c) min pages to wake pagedaemon */
u_int vmd_interrupt_free_min; /* (c) reserved pages for int code */
u_int vmd_free_severe; /* (c) severe page depletion point */
/* Name for sysctl etc. */
struct sysctl_oid *vmd_oid;
char vmd_name[sizeof(__XSTRING(MAXMEMDOM))];
} __aligned(CACHE_LINE_SIZE);
extern struct vm_domain vm_dom[MAXMEMDOM];
#define VM_DOMAIN(n) (&vm_dom[(n)])
#define VM_DOMAIN_EMPTY(n) (vm_dom[(n)].vmd_page_count == 0)
#define vm_pagequeue_assert_locked(pq) mtx_assert(&(pq)->pq_mutex, MA_OWNED)
#define vm_pagequeue_lock(pq) mtx_lock(&(pq)->pq_mutex)
#define vm_pagequeue_lockptr(pq) (&(pq)->pq_mutex)
#define vm_pagequeue_trylock(pq) mtx_trylock(&(pq)->pq_mutex)
#define vm_pagequeue_unlock(pq) mtx_unlock(&(pq)->pq_mutex)
#define vm_domain_free_assert_locked(n) \
mtx_assert(vm_domain_free_lockptr((n)), MA_OWNED)
#define vm_domain_free_assert_unlocked(n) \
mtx_assert(vm_domain_free_lockptr((n)), MA_NOTOWNED)
#define vm_domain_free_lock(d) \
mtx_lock(vm_domain_free_lockptr((d)))
#define vm_domain_free_lockptr(d) \
(&(d)->vmd_free_mtx)
#define vm_domain_free_trylock(d) \
mtx_trylock(vm_domain_free_lockptr((d)))
#define vm_domain_free_unlock(d) \
mtx_unlock(vm_domain_free_lockptr((d)))
#define vm_domain_pageout_lockptr(d) \
(&(d)->vmd_pageout_mtx)
#define vm_domain_pageout_assert_locked(n) \
mtx_assert(vm_domain_pageout_lockptr((n)), MA_OWNED)
#define vm_domain_pageout_assert_unlocked(n) \
mtx_assert(vm_domain_pageout_lockptr((n)), MA_NOTOWNED)
#define vm_domain_pageout_lock(d) \
mtx_lock(vm_domain_pageout_lockptr((d)))
#define vm_domain_pageout_unlock(d) \
mtx_unlock(vm_domain_pageout_lockptr((d)))
static __inline void
vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend)
{
vm_pagequeue_assert_locked(pq);
pq->pq_cnt += addend;
}
#define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1)
#define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1)
static inline void
vm_pagequeue_remove(struct vm_pagequeue *pq, vm_page_t m)
{
TAILQ_REMOVE(&pq->pq_pl, m, plinks.q);
vm_pagequeue_cnt_dec(pq);
}
static inline void
vm_batchqueue_init(struct vm_batchqueue *bq)
{
bq->bq_cnt = 0;
}
static inline bool
vm_batchqueue_insert(struct vm_batchqueue *bq, vm_page_t m)
{
if (bq->bq_cnt < nitems(bq->bq_pa)) {
bq->bq_pa[bq->bq_cnt++] = m;
return (true);
}
return (false);
}
static inline vm_page_t
vm_batchqueue_pop(struct vm_batchqueue *bq)
{
if (bq->bq_cnt == 0)
return (NULL);
return (bq->bq_pa[--bq->bq_cnt]);
}
void vm_domain_set(struct vm_domain *vmd);
void vm_domain_clear(struct vm_domain *vmd);
int vm_domain_allocate(struct vm_domain *vmd, int req, int npages);
/*
* vm_pagequeue_domain:
*
* Return the memory domain the page belongs to.
*/
static inline struct vm_domain *
vm_pagequeue_domain(vm_page_t m)
{
return (VM_DOMAIN(vm_phys_domain(m)));
}
/*
* Return the number of pages we need to free-up or cache
* A positive number indicates that we do not have enough free pages.
*/
static inline int
vm_paging_target(struct vm_domain *vmd)
{
return (vmd->vmd_free_target - vmd->vmd_free_count);
}
/*
* Returns TRUE if the pagedaemon needs to be woken up.
*/
static inline int
vm_paging_needed(struct vm_domain *vmd, u_int free_count)
{
return (free_count < vmd->vmd_pageout_wakeup_thresh);
}
/*
* Returns TRUE if the domain is below the min paging target.
*/
static inline int
vm_paging_min(struct vm_domain *vmd)
{
return (vmd->vmd_free_min > vmd->vmd_free_count);
}
/*
* Returns TRUE if the domain is below the severe paging target.
*/
static inline int
vm_paging_severe(struct vm_domain *vmd)
{
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_ */
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