linux/arch/microblaze
Shaohua Li 45cac65b0f readahead: fault retry breaks mmap file read random detection
.fault now can retry.  The retry can break state machine of .fault.  In
filemap_fault, if page is miss, ra->mmap_miss is increased.  In the second
try, since the page is in page cache now, ra->mmap_miss is decreased.  And
these are done in one fault, so we can't detect random mmap file access.

Add a new flag to indicate .fault is tried once.  In the second try, skip
ra->mmap_miss decreasing.  The filemap_fault state machine is ok with it.

I only tested x86, didn't test other archs, but looks the change for other
archs is obvious, but who knows :)

Signed-off-by: Shaohua Li <shaohua.li@fusionio.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-09 16:22:47 +09:00
..
boot Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2012-03-30 18:15:43 -07:00
configs kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
include atomic: implement generic atomic_dec_if_positive() 2012-10-09 16:22:46 +09:00
kernel Revert "microblaze_mmu_v2: Update signal returning address" 2012-10-04 18:56:39 +02:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next 2012-03-30 12:10:03 +02:00
mm readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
oprofile microblaze: Core oprofile configs and hooks 2009-12-14 08:45:07 +01:00
pci PCI changes for the 3.6 merge window: 2012-07-24 16:17:07 -07:00
platform Fix common misspellings 2011-03-31 11:26:23 -03:00
Kconfig Kconfig: clean up the long arch list for the DEBUG_KMEMLEAK config option 2012-10-09 16:22:14 +09:00
Kconfig.debug microblaze: remove obsolete DEBUG_BOOTMEM 2011-01-10 09:29:51 +01:00
Makefile Fix common misspellings 2011-03-31 11:26:23 -03:00