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280d15cd0a
freebsd-skq/sys/vm
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Mark Johnston 280d15cd0a Fix two problems with the page daemon control loop. 
Both issues caused the page daemon to erroneously go to sleep when
applications are consuming free pages at a high rate, leaving the
application threads blocked in VM_WAIT.

1) After completing an inactive queue scan, concurrent allocations may
   have prevented the page daemon from meeting the v_free_min threshold.
   In this case, the page daemon was going to sleep even when the
   inactive queue contained plenty of clean pages.
2) pagedaemon_wakeup() may be called without the free queues lock held.
   This can lead to a lost wakeup if a call occurs after the page daemon
   clears vm_pageout_wanted but before going to sleep.

Fix 1) by ensuring that we start a new inactive queue scan immediately
if v_free_count < v_free_min after a prior scan.

Fix 2) by adding a new subroutine, pagedaemon_wait(), called from
vm_wait() and vm_waitpfault(). It wakes up the page daemon if either
vm_pages_needed or vm_pageout_wanted is false, and atomically sleeps
on v_free_count.

Reported by:	jeff
Reviewed by:	alc
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D13424
2017-12-24 19:45:16 +00:00
..
_vm_radix.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
default_pager.c SPDX: wrong license. 2017-11-30 15:45:42 +00:00
device_pager.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
memguard.c Eliminate kmem_arena and kmem_object in preparation for further NUMA commits. 2017-11-28 23:40:54 +00:00
memguard.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
phys_pager.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
pmap.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
redzone.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
redzone.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
sg_pager.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
swap_pager.c When the swap pager allocates space on disk, it requests contiguous 2017-11-28 17:46:03 +00:00
swap_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
uma_core.c Perform all accesses to uma_reclaim_needed using atomic(9) KPI. 2017-12-19 10:06:55 +00:00
uma_dbg.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
uma_dbg.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
uma_int.h Eliminate kmem_arena and kmem_object in preparation for further NUMA commits. 2017-11-28 23:40:54 +00:00
uma.h Eliminate kmem_arena and kmem_object in preparation for further NUMA commits. 2017-11-28 23:40:54 +00:00
vm_domain.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_domain.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_extern.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
vm_fault.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_glue.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_init.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_kern.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_kern.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_map.c Add comment for vm_map_find_min(). 2017-12-01 10:53:08 +00:00
vm_map.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_meter.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
vm_mmap.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
vm_object.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_object.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_page.c Fix two problems with the page daemon control loop. 2017-12-24 19:45:16 +00:00
vm_page.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_pageout.c Fix two problems with the page daemon control loop. 2017-12-24 19:45:16 +00:00
vm_pageout.h Fix two problems with the page daemon control loop. 2017-12-24 19:45:16 +00:00
vm_pager.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
vm_param.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_phys.c Print the correct value when freelist is out of range. 2017-12-04 11:16:51 +00:00
vm_phys.h Move domain iterators into the page layer where domain selection should take 2017-11-28 23:18:35 +00:00
vm_radix.c sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
vm_radix.h sys: general adoption of SPDX licensing ID tags. 2017-11-27 15:23:17 +00:00
vm_reserv.c Move domain iterators into the page layer where domain selection should take 2017-11-28 23:18:35 +00:00
vm_reserv.h Move domain iterators into the page layer where domain selection should take 2017-11-28 23:18:35 +00:00
vm_swapout_dummy.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_swapout.c SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vm_unix.c sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
vm.h SPDX: Consider code from Carnegie-Mellon University. 2017-11-30 15:48:35 +00:00
vnode_pager.c spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
vnode_pager.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00