linux/arch/sparc
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 sparc32: drop build time btfixup patching 2012-05-14 14:05:10 -07:00
configs perf: Remove PERF_COUNTERS config option 2012-04-26 13:52:52 +02:00
crypto sparc64: Fix function argument comment in camellia_sparc64_key_expand asm. 2012-09-21 12:04:51 -07:00
include mm: hugetlb: add arch hook for clearing page flags before entering pool 2012-10-09 16:22:24 +09:00
kernel mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
lib sparc64: Niagara-4 bzero/memset, plus use MRU stores in page copy. 2012-10-05 13:45:26 -07:00
math-emu sparc64: Fix several bugs in quad floating point emulation. 2012-05-25 00:31:56 -07:00
mm readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
net sparc: bpf_jit_comp: add XOR instruction for BPF JIT JIT 2012-09-27 18:04:35 -04:00
oprofile
prom sparc32: Remove superfluous extern declarations for prom_*() functions 2012-06-27 01:27:45 -07:00
Kbuild sparc64: Add SHA1 driver making use of the 'sha1' instruction. 2012-08-20 15:08:49 -07:00
Kconfig Kconfig: clean up the "#if defined(arch)" list for exception-trace sysctl entry 2012-10-09 16:22:14 +09:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Makefile Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-21 19:43:57 -07:00