android_kernel_oneplus_msm8998/arch
Mel Gorman 2b4847e730 mm: numa: serialise parallel get_user_page against THP migration
Base pages are unmapped and flushed from cache and TLB during normal
page migration and replaced with a migration entry that causes any
parallel NUMA hinting fault or gup to block until migration completes.

THP does not unmap pages due to a lack of support for migration entries
at a PMD level.  This allows races with get_user_pages and
get_user_pages_fast which commit 3f926ab945 ("mm: Close races between
THP migration and PMD numa clearing") made worse by introducing a
pmd_clear_flush().

This patch forces get_user_page (fast and normal) on a pmd_numa page to
go through the slow get_user_page path where it will serialise against
THP migration and properly account for the NUMA hinting fault.  On the
migration side the page table lock is taken for each PTE update.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-12-18 19:04:50 -08:00
..
alpha Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha 2013-11-20 15:03:45 -08:00
arc ARC: [perf] Fix a few thinkos 2013-11-28 15:49:59 +05:30
arm Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2013-12-13 16:16:03 -08:00
arm64 arm64: mm: Fix PMD_SECT_PROT_NONE definition 2013-12-06 17:22:44 +00:00
avr32 avr32: favr-32: clk_round_rate() can return a zero upon error 2013-12-10 08:46:38 +01:00
blackfin
c6x
cris
frv
hexagon
ia64
m32r
m68k
metag
microblaze
mips
mn10300
openrisc
parisc parisc: update 64bit defconfigs and use SIL680 instead of SIIMAGE driver 2013-12-03 23:23:35 +01:00
powerpc powerpc/powernv: Fix OPAL LPC access in Little Endian 2013-12-13 15:55:15 +11:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2013-12-10 11:02:33 -08:00
score
sh
sparc
tile
um um: Build always with -mcmodel=large on 64bit 2013-12-01 13:06:51 +01:00
unicore32
x86 mm: numa: serialise parallel get_user_page against THP migration 2013-12-18 19:04:50 -08:00
xtensa
.gitignore
Kconfig