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
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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
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sparc
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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