kernel_optimize_test/mm
Gleb Natapov 318b275fbc mm: allow GUP to fail instead of waiting on a page
GUP user may want to try to acquire a reference to a page if it is already
in memory, but not if IO, to bring it in, is needed.  For example KVM may
tell vcpu to schedule another guest process if current one is trying to
access swapped out page.  Meanwhile, the page will be swapped in and the
guest process, that depends on it, will be able to run again.

This patch adds FAULT_FLAG_RETRY_NOWAIT (suggested by Linus) and
FOLL_NOWAIT follow_page flags.  FAULT_FLAG_RETRY_NOWAIT, when used in
conjunction with VM_FAULT_ALLOW_RETRY, indicates to handle_mm_fault that
it shouldn't drop mmap_sem and wait on a page, but return VM_FAULT_RETRY
instead.

[akpm@linux-foundation.org: improve FOLL_NOWAIT comment]
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22 17:44:02 -07:00
..
backing-dev.c
bootmem.c
bounce.c
compaction.c mm/compaction: check migrate_pages's return value instead of list_empty() 2011-03-22 17:44:00 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c mm: allow GUP to fail instead of waiting on a page 2011-03-22 17:44:02 -07:00
fremap.c
highmem.c
huge_memory.c
hugetlb.c
hwpoison-inject.c
init-mm.c
internal.h mm: export __get_user_pages 2011-03-17 13:08:27 -03:00
Kconfig
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c
memory_hotplug.c
memory-failure.c mm: remove is_hwpoison_address 2011-03-17 13:08:27 -03:00
memory.c mm: allow GUP to fail instead of waiting on a page 2011-03-22 17:44:02 -07:00
mempolicy.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-03-18 10:37:40 -07:00
mempool.c
migrate.c
mincore.c
mlock.c
mm_init.c
mmap.c
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c
oom_kill.c oom: suppress nodes that are not allowed from meminfo on oom kill 2011-03-22 17:44:01 -07:00
page_alloc.c oom: suppress nodes that are not allowed from meminfo on page alloc failure 2011-03-22 17:44:01 -07:00
page_cgroup.c mm: notifier_from_errno() cleanup 2011-03-22 17:44:01 -07:00
page_io.c
page_isolation.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
prio_tree.c
quicklist.c
readahead.c
rmap.c
shmem.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-03-18 10:37:40 -07:00
slab.c mm: notifier_from_errno() cleanup 2011-03-22 17:44:01 -07:00
slob.c
slub.c slub: Add statistics for this_cmpxchg_double failures 2011-03-22 20:48:04 +02:00
sparse-vmemmap.c
sparse.c
swap_state.c
swap.c
swapfile.c mm: swap: unlock swapfile inode mutex before closing file on bad swapfiles 2011-03-22 17:43:58 -07:00
thrash.c
truncate.c
util.c
vmalloc.c mm: vmap area cache 2011-03-22 17:44:00 -07:00
vmscan.c mm: compaction: prevent kswapd compacting memory to reduce CPU usage 2011-03-22 17:44:00 -07:00
vmstat.c