You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Martin Hicks 753ee72896 [PATCH] VM: early zone reclaim ... This is the core of the (much simplified) early reclaim. The goal of this patch is to reclaim some easily-freed pages from a zone before falling back onto another zone. One of the major uses of this is NUMA machines. With the default allocator behavior the allocator would look for memory in another zone, which might be off-node, before trying to reclaim from the current zone. This adds a zone tuneable to enable early zone reclaim. It is selected on a per-zone basis and is turned on/off via syscall. Adding some extra throttling on the reclaim was also required (patch 4/4). Without the machine would grind to a crawl when doing a "make -j" kernel build. Even with this patch the System Time is higher on average, but it seems tolerable. Here are some numbers for kernbench runs on a 2-node, 4cpu, 8Gig RAM Altix in the "make -j" run: wall user sys %cpu ctx sw. sleeps ---- ---- --- ---- ------ ------ No patch 1009 1384 847 258 298170 504402 w/patch, no reclaim 880 1376 667 288 254064 396745 w/patch & reclaim 1079 1385 926 252 291625 548873 These numbers are the average of 2 runs of 3 "make -j" runs done right after system boot. Run-to-run variability for "make -j" is huge, so these numbers aren't terribly useful except to seee that with reclaim the benchmark still finishes in a reasonable amount of time. I also looked at the NUMA hit/miss stats for the "make -j" runs and the reclaim doesn't make any difference when the machine is thrashing away. Doing a "make -j8" on a single node that is filled with page cache pages takes 700 seconds with reclaim turned on and 735 seconds without reclaim (due to remote memory accesses). The simple zone_reclaim syscall program is at http://www.bork.org/~mort/sgi/zone_reclaim.c Signed-off-by: Martin Hicks <mort@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		20 years ago
..
alpha	[PATCH] alpha/osf_sys: use helper functions to convert between tv and jiffies	20 years ago
arm	Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6	20 years ago
arm26	[PATCH] Driver Core: arch: update device attribute callbacks	20 years ago
cris	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
frv	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
h8300	[PATCH] h8300 sleep problem	20 years ago
i386	[PATCH] VM: early zone reclaim	20 years ago
ia64	[PATCH] VM: early zone reclaim	20 years ago
m32r	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
m68k	[PATCH] M68k: Mark Sun-3 NCR5380 SCSI broken	20 years ago
m68knommu	[PATCH] m68knommu: fix scheduling and race problems in idle loop	20 years ago
mips	[PATCH] mips: add resource management to pmu	20 years ago
parisc	[PATCH] Driver Core: arch: update device attribute callbacks	20 years ago
ppc	[PATCH] smp_processor_id() cleanup	20 years ago
ppc64	[PATCH] smp_processor_id() cleanup	20 years ago
s390	[PATCH] s390: deadlock in appldata	20 years ago
sh	[PATCH] smp_processor_id() cleanup	20 years ago
sh64	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
sparc	[SPARC]: Remove legacy stuff from cpu_idle().	20 years ago
sparc64	[PATCH] smp_processor_id() cleanup	20 years ago
um	[PATCH] uml: slirp and slip driver cleanups and fixes	20 years ago
v850	[PATCH] convert that currently tests _NSIG directly to use valid_signal()	20 years ago
x86_64	[PATCH] smp_processor_id() cleanup	20 years ago