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Christoph Lameter 9614634fe6 [PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O 
It turns out that it is advantageous to leave a small portion of unmapped file
backed pages if all of a zone's pages (or almost all pages) are allocated and
so the page allocator has to go off-node.

This allows recently used file I/O buffers to stay on the node and
reduces the times that zone reclaim is invoked if file I/O occurs
when we run out of memory in a zone.

The problem is that zone reclaim runs too frequently when the page cache is
used for file I/O (read write and therefore unmapped pages!) alone and we have
almost all pages of the zone allocated.  Zone reclaim may remove 32 unmapped
pages.  File I/O will use these pages for the next read/write requests and the
unmapped pages increase.  After the zone has filled up again zone reclaim will
remove it again after only 32 pages.  This cycle is too inefficient and there
are potentially too many zone reclaim cycles.

With the 1% boundary we may still remove all unmapped pages for file I/O in
zone reclaim pass.  However.  it will take a large number of read and writes
to get back to 1% again where we trigger zone reclaim again.

The zone reclaim 2.6.16/17 does not show this behavior because we have a 30
second timeout.

[akpm@osdl.org: rename the /proc file and the variable]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2006-07-03 15:26:59 -07:00
..
irq [PATCH] genirq:fixup missing SA_PERCPU replacement 2006-07-02 17:29:22 -07:00
power remove obsolete swsusp_encrypt 2006-06-30 18:59:59 +02:00
time [PATCH] time: rename clocksource functions 2006-06-26 09:58:21 -07:00
.gitignore gitignore: ignore more generated files 2006-01-03 11:35:26 +01:00
Kconfig.hz [PATCH] i386: Selectable Frequency of the Timer Interrupt 2005-06-23 09:45:10 -07:00
Kconfig.preempt [PATCH] sched: voluntary kernel preemption 2005-06-25 16:24:45 -07:00
Makefile [PATCH] pi-futex: rt mutex tester 2006-06-27 17:32:47 -07:00
acct.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
audit.c [NETLINK]: Encapsulate eff_cap usage within security framework. 2006-06-29 16:57:55 -07:00
audit.h [PATCH] add rule filterkey 2006-07-01 05:43:06 -04:00
auditfilter.c [PATCH] audit syscall classes 2006-07-01 07:44:10 -04:00
auditsc.c [PATCH] audit: support for object context filters 2006-07-01 05:44:19 -04:00
capability.c [PATCH] refactor capable() to one implementation, add __capable() helper 2006-03-25 08:22:56 -08:00
compat.c [PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__ 2006-06-25 10:01:15 -07:00
configs.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpu.c [PATCH] cpu hotplug: make [un]register_cpu_notifier init time only 2006-06-27 17:32:41 -07:00
cpuset.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
dma.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exec_domain.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
exit.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
extable.c [PATCH] symbol_put_addr() locks kernel 2006-05-15 11:20:55 -07:00
fork.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
futex.c [PATCH] pi-futex: futex_wake() lockup fix 2006-07-01 09:55:57 -07:00
futex_compat.c [PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support 2006-06-27 17:32:47 -07:00
hrtimer.c [PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17 2006-06-27 17:32:41 -07:00
itimer.c [PATCH] hrtimers: remove data field 2006-03-26 08:57:03 -08:00
kallsyms.c [PATCH] fix missing includes 2005-10-30 17:37:32 -08:00
kexec.c [POWERPC] Add the use of the firmware soft-reset-nmi to kdump. 2006-06-28 15:18:52 +10:00
kfifo.c [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
kmod.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
kprobes.c [PATCH] Notify page fault call chain 2006-06-26 09:58:22 -07:00
ksysfs.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
kthread.c [PATCH] kthread: move kernel-doc and put it into DocBook 2006-06-25 10:01:24 -07:00
module.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
mutex-debug.c [PATCH] poison: add & use more constants 2006-06-27 17:32:38 -07:00
mutex-debug.h [PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs 2006-06-26 09:58:16 -07:00
mutex.c [PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs 2006-06-26 09:58:16 -07:00
mutex.h [PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs 2006-06-26 09:58:16 -07:00
panic.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
params.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pid.c [PATCH] pidhash: Refactor the pid hash table 2006-03-31 12:19:00 -08:00
posix-cpu-timers.c [PATCH] arm_timer: remove a racy and obsolete PF_EXITING check 2006-06-17 10:52:13 -07:00
posix-timers.c [PATCH] hrtimers: remove data field 2006-03-26 08:57:03 -08:00
printk.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
profile.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ptrace.c [PATCH] coredump: kill ptrace related stuff 2006-06-26 09:58:27 -07:00
rcupdate.c [PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17 2006-06-27 17:32:41 -07:00
rcutorture.c [PATCH] rcutorture: add call_rcu_bh() operations 2006-06-27 17:32:40 -07:00
relay.c [PATCH] relay: consolidate sendfile() and read() code 2006-03-23 19:58:45 +01:00
resource.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
rtmutex-debug.c [PATCH] pi-futex: rt mutex debug 2006-06-27 17:32:47 -07:00
rtmutex-debug.h [PATCH] pi-futex: rt mutex debug 2006-06-27 17:32:47 -07:00
rtmutex-tester.c [PATCH] rtmutex: Modify rtmutex-tester to test the setscheduler propagation 2006-06-27 17:32:47 -07:00
rtmutex.c [PATCH] rtmutex: Propagate priority settings into PI lock chains 2006-06-27 17:32:48 -07:00
rtmutex.h [PATCH] pi-futex: rt mutex core 2006-06-27 17:32:47 -07:00
rtmutex_common.h [PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support 2006-06-27 17:32:47 -07:00
sched.c [PATCH] cond_resched() fix 2006-06-30 11:25:38 -07:00
seccomp.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2006-06-30 15:39:30 -07:00
softirq.c [PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17 2006-06-27 17:32:41 -07:00
softlockup.c [PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17 2006-06-27 17:32:41 -07:00
spinlock.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
stop_machine.c [PATCH] kthread: convert stop_machine into a kthread 2006-06-25 10:01:22 -07:00
sys.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
sys_ni.c [PATCH] sys_move_pages: 32bit support (i386, x86_64) 2006-06-23 07:42:53 -07:00
sysctl.c [PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O 2006-07-03 15:26:59 -07:00
time.c [PATCH] Time: Introduce arch generic time accessors 2006-06-26 09:58:20 -07:00
timer.c [PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17 2006-06-27 17:32:41 -07:00
uid16.c [PATCH] Add more prevent_tail_call() 2006-04-19 16:27:18 -07:00
unwind.c [PATCH] x86_64: allow unwinder to build without module support 2006-06-26 10:48:18 -07:00
user.c [PATCH] selinux: add hooks for key subsystem 2006-06-22 15:05:55 -07:00
wait.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
workqueue.c [PATCH] cpu hotplug: revert init patch submitted for 2.6.17 2006-06-27 17:32:40 -07:00