John Dykstra fa83523f45 x86/mm/pat: Improve scaling of pat_pagerange_is_ram() ...

Function pat_pagerange_is_ram() scales poorly to large address
ranges, because it probes the resource tree for each page.

On a 2.6 GHz Opteron, this function consumes 34 ms for a 1 GB range.

It is called twice during untrack_pfn_vma(), slowing process
cleanup and handicapping the OOM killer.

This replacement consumes less than 1ms, under the same conditions.

Signed-off-by: John Dykstra <jdykstra@cray.com> on behalf of Cray Inc.
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1337980366.1979.6.camel@redwood
[ Small stylistic cleanups and renames ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2012-05-30 10:57:11 +02:00

..

kmemcheck

bug.h: add include of it to various implicit C users

2012-02-29 17:15:08 -05:00

amdtopology.c

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dump_pagetables.c

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extable.c

x86, extable: Switch to relative exception table entries

2012-04-20 17:22:34 -07:00

fault.c

userns: Store uid and gid values in struct cred with kuid_t and kgid_t types

2012-05-03 03:28:38 -07:00

gup.c

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highmem_32.c

highmem: kill all __kmap_atomic()

2012-03-20 21:48:30 +08:00

hugetlbpage.c

hugetlb: remove prev_vma from hugetlb_get_unmapped_area_topdown()

2012-03-21 17:54:59 -07:00

init_32.c

Disintegrate asm/system.h for X86

2012-03-28 18:11:12 +01:00

init_64.c

Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-05-23 11:06:59 -07:00

init.c

Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-05-23 11:06:59 -07:00

iomap_32.c

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ioremap.c

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kmmio.c

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Makefile

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memtest.c

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mmap.c

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mmio-mod.c

module_param: make bool parameters really bool (arch)

2012-01-13 09:32:18 +10:30

numa_32.c

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numa_64.c

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numa_emulation.c

x86/numa: Allow specifying node_distance() for numa=fake

2012-05-09 13:28:59 +02:00

numa_internal.h

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numa.c

cpumask: update setup_node_to_cpumask_map() comments

2012-01-12 20:13:11 -08:00

pageattr-test.c

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pageattr.c

Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-01-11 19:12:10 -08:00

pat_internal.h

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pat_rbtree.c

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pat.c

x86/mm/pat: Improve scaling of pat_pagerange_is_ram()

2012-05-30 10:57:11 +02:00

pf_in.c

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pf_in.h

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pgtable_32.c

Disintegrate asm/system.h for X86

2012-03-28 18:11:12 +01:00

pgtable.c

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physaddr.c

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physaddr.h

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setup_nx.c

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srat.c

x86/apic: Add separate apic_id_valid() functions for selected apic drivers

2012-03-23 13:28:43 +01:00

testmmiotrace.c

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tlb.c

Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-05-23 11:06:59 -07:00