linux/arch/cris
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
..
arch-v10 new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
arch-v32 CRIS changes for 3.7 2012-10-03 07:36:36 -07:00
boot Fix common misspellings 2011-03-31 11:26:23 -03:00
configs kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
include cross-arch: don't corrupt personality flags upon exec() 2012-10-06 03:04:47 +09:00
kernel cris: Add missing RCU idle APIs on idle loop 2012-09-23 07:44:44 -07:00
mm readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
Kconfig Kconfig: clean up the long arch list for the UID16 config option 2012-10-09 16:22:13 +09:00
Kconfig.debug Kconfig: remove a few puzzling comments 2011-10-31 10:58:48 +01:00
Makefile UAPI: Partition the header include path sets and add uapi/ header directories 2012-10-02 18:01:26 +01:00