linux/arch/tile/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
..
elf.c mm: use mm->exe_file instead of first VM_EXECUTABLE vma->vm_file 2012-10-09 16:22:18 +09:00
extable.c arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
fault.c readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
highmem.c tile: remove usage of enum km_type 2012-07-23 14:11:23 +08:00
homecache.c tilegx pci: support I/O to arbitrarily-cached pages 2012-07-18 16:40:05 -04:00
hugetlbpage.c arch/tile: support multiple huge page sizes dynamically 2012-05-25 12:48:27 -04:00
init.c arch/tile: enable ZONE_DMA for tilegx 2012-07-18 16:40:11 -04:00
Makefile arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
migrate_32.S arch/tile: use interrupt critical sections less 2012-05-25 12:48:20 -04:00
migrate_64.S arch/tile: use interrupt critical sections less 2012-05-25 12:48:20 -04:00
migrate.h arch/tile: use interrupt critical sections less 2012-05-25 12:48:20 -04:00
mmap.c arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
pgtable.c arch/tile: tilegx PCI root complex support 2012-07-18 16:39:11 -04:00