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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-03-17 14:20:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | 2a52bcbcc688eecead2953143f7ef695b8e44575 (patch) | |
| tree | b2e372875693775e97fc4e9373c5a630d2a1dcc0 /include/linux/rmap.h | |
| parent | b97731992d00f09456726bfc5ab6641c07773038 (diff) | |
| download | lwn-2a52bcbcc688eecead2953143f7ef695b8e44575.tar.gz lwn-2a52bcbcc688eecead2953143f7ef695b8e44575.zip | |
rmap: extend try_to_unmap() to be usable by split_huge_page()
Add support for two ttu_flags:
- TTU_SPLIT_HUGE_PMD would split PMD if it's there, before trying to
unmap page;
- TTU_RMAP_LOCKED indicates that caller holds relevant rmap lock;
Also, change rwc->done to !page_mapcount() instead of !page_mapped().
try_to_unmap() works on pte level, so we are really interested in the
mappedness of this small page rather than of the compound page it's a
part of.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
| -rw-r--r-- | include/linux/rmap.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index a5875e9b4a27..3d975e2252d4 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -86,6 +86,7 @@ enum ttu_flags { TTU_MIGRATION = 2, /* migration mode */ TTU_MUNLOCK = 4, /* munlock mode */ TTU_LZFREE = 8, /* lazy free mode */ + TTU_SPLIT_HUGE_PMD = 16, /* split huge PMD if any */ TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ @@ -93,6 +94,8 @@ enum ttu_flags { TTU_BATCH_FLUSH = (1 << 11), /* Batch TLB flushes where possible * and caller guarantees they will * do a final flush if necessary */ + TTU_RMAP_LOCKED = (1 << 12) /* do not grab rmap lock: + * caller holds it */ }; #ifdef CONFIG_MMU |