linux/include
Christoph Lameter 0ff38490c8 [PATCH] zone_reclaim: dynamic slab reclaim
Currently one can enable slab reclaim by setting an explicit option in
/proc/sys/vm/zone_reclaim_mode.  Slab reclaim is then used as a final
option if the freeing of unmapped file backed pages is not enough to free
enough pages to allow a local allocation.

However, that means that the slab can grow excessively and that most memory
of a node may be used by slabs.  We have had a case where a machine with
46GB of memory was using 40-42GB for slab.  Zone reclaim was effective in
dealing with pagecache pages.  However, slab reclaim was only done during
global reclaim (which is a bit rare on NUMA systems).

This patch implements slab reclaim during zone reclaim.  Zone reclaim
occurs if there is a danger of an off node allocation.  At that point we

1. Shrink the per node page cache if the number of pagecache
   pages is more than min_unmapped_ratio percent of pages in a zone.

2. Shrink the slab cache if the number of the nodes reclaimable slab pages
   (patch depends on earlier one that implements that counter)
   are more than min_slab_ratio (a new /proc/sys/vm tunable).

The shrinking of the slab cache is a bit problematic since it is not node
specific.  So we simply calculate what point in the slab we want to reach
(current per node slab use minus the number of pages that neeed to be
allocated) and then repeately run the global reclaim until that is
unsuccessful or we have reached the limit.  I hope we will have zone based
slab reclaim at some point which will make that easier.

The default for the min_slab_ratio is 5%

Also remove the slab option from /proc/sys/vm/zone_reclaim_mode.

[akpm@osdl.org: cleanups]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-26 08:48:51 -07:00
..
acpi Pull acpi_os_allocate into test branch 2006-07-10 02:39:47 -04:00
asm-alpha [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-arm [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-arm26 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-cris [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-frv [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-generic [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-h8300 Fix H8300 exported headers. 2006-09-21 08:51:43 +01:00
asm-i386 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-ia64 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-m32r [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-m68k [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-m68knommu Fix m68knommu exported headers 2006-09-21 08:50:36 +01:00
asm-mips [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-parisc [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-powerpc [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-ppc [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-s390 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-sh [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-sh64 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-sparc [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-sparc64 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-um [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-v850 Fix v850 exported headers 2006-09-21 09:05:25 +01:00
asm-x86_64 [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
asm-xtensa [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
crypto [CRYPTO] digest: Added user API for new hash type 2006-09-21 11:46:17 +10:00
keys
linux [PATCH] zone_reclaim: dynamic slab reclaim 2006-09-26 08:48:51 -07:00
math-emu
media V4L/DVB (4605): Fixes an issue with V4L1 and make headers-install 2006-09-10 13:45:55 -03:00
mtd Merge git://git.infradead.org/~dwmw2/hdroneline 2006-09-22 12:56:22 -07:00
net [NetLabel]: rework the Netlink attribute handling (part 1) 2006-09-25 15:56:09 -07:00
pcmcia
rdma IB/sa: fix ib_sa_selector names 2006-09-22 15:22:55 -07:00
rxrpc
scsi [PATCH] SCSI gfp_t annotations 2006-09-24 20:07:49 -07:00
sound [ALSA] ak4xxx - Remove bogus IPGA controls 2006-09-23 10:46:55 +02:00
video [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00
Kbuild [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00