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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>		19 years ago
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acpi	Pull acpica into release branch	19 years ago
asm-alpha	[PATCH] irq-flags: ALPHA: Use the new IRQF_ constants	19 years ago
asm-arm	[PATCH] ARM: fixup irqflags breakage after ARM genirq merge	19 years ago
asm-arm26	[PATCH] irq-flags: ARM26: Use the new IRQF_ constants	19 years ago
asm-cris	[PATCH] irq-flags: CRIS: Use the new IRQF_ constants	19 years ago
asm-frv	[PATCH] irq-flags: FRV: Use the new IRQF_ constants	19 years ago
asm-generic	Merge branch 'audit.b22' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current	19 years ago
asm-h8300	[PATCH] irq-flags: H8300: Use the new IRQF_ constants	19 years ago
asm-i386	[PATCH] irq-flags: i386: Use the new IRQF_ constants	19 years ago
asm-ia64	[PATCH] genirq ia64 cleanup	19 years ago
asm-m32r	[PATCH] irq-flags: M32R: Use the new IRQF_ constants	19 years ago
asm-m68k	[PATCH] irq-flags: M68K: Use the new IRQF_ constants	19 years ago
asm-m68knommu	[PATCH] irq-flags: M68KNOMMU: Use the new IRQF_ constants	19 years ago
asm-mips	[PATCH] irq-flags: MIPS: Use the new IRQF_ constants	19 years ago
asm-parisc	[PATCH] irq-flags: PARISC: Use the new IRQF_ constants	19 years ago
asm-powerpc	[PATCH] irq-flags: POWERPC: Use the new IRQF_ constants	19 years ago
asm-ppc	[PATCH] irq-flags: PPC: Use the new IRQF_ constants	19 years ago
asm-s390	[PATCH] irq-flags: S390: Use the new IRQF_ constants	19 years ago
asm-sh	[PATCH] irq-flags: SH: Use the new IRQF_ constants	19 years ago
asm-sh64	[PATCH] irq-flags: SH64: Use the new IRQF_ constants	19 years ago
asm-sparc	[PATCH] irq-flags: SPARC: Use the new IRQF_ constants	19 years ago
asm-sparc64	[PATCH] irq-flags: SPARC64: Use the new IRQF_ constants	19 years ago
asm-um	[PATCH] uml: make copy_*_user atomic	19 years ago
asm-v850	[PATCH] irq-flags: V850: Use the new IRQF_ constants	19 years ago
asm-x86_64	[PATCH] irq-flags: x86_64: Use the new IRQF_ constants	19 years ago
asm-xtensa	[PATCH] irq-flags: XTENSA: Use the new IRQF_ constants	19 years ago
keys	[PATCH] keys: discard the contents of a key on revocation	19 years ago
linux	[PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O	19 years ago
math-emu	…
media	V4L/DVB (4270): Add tda9887-specific tuner configuration	19 years ago
mtd	Merge git://git.infradead.org/hdrcleanup-2.6	19 years ago
net	[PATCH] irq-flags: drivers/net: Use the new IRQF_ constants	19 years ago
pcmcia	Don't include linux/config.h from anywhere else in include/	19 years ago
rdma	IB/uverbs: Don't serialize with ib_uverbs_idr_mutex	19 years ago
rxrpc	…
scsi	Merge branch 'master' into upstream	19 years ago
sound	[PATCH] irq-flags: sound: Use the new IRQF_ constants	19 years ago
video	Don't include linux/config.h from anywhere else in include/	19 years ago