linux/arch/hexagon/mm
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
..
Makefile Hexagon: Add configuration and makefiles for the Hexagon architecture. 2011-11-01 07:34:21 -07:00
cache.c Hexagon: Implement basic cache-flush support 2011-11-01 07:34:20 -07:00
copy_from_user.S Hexagon: Add user access functions 2011-11-01 07:34:20 -07:00
copy_to_user.S Hexagon: Add user access functions 2011-11-01 07:34:20 -07:00
copy_user_template.S Hexagon: Add user access functions 2011-11-01 07:34:20 -07:00
init.c Hexagon: Add page-fault support. 2011-11-01 07:34:20 -07:00
ioremap.c Hexagon: Add ioremap support 2011-11-01 07:34:20 -07:00
pgalloc.c Hexagon: Add page table header files & etc. 2011-11-01 07:34:20 -07:00
strnlen_user.S Hexagon: Add user access functions 2011-11-01 07:34:20 -07:00
uaccess.c Hexagon: Add user access functions 2011-11-01 07:34:20 -07:00
vm_fault.c readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
vm_tlb.c Hexagon: Implement basic TLB management routines for Hexagon. 2011-11-01 07:34:20 -07:00