Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCH 07/16] page-flags: define behavior SL*B-related flags on compound pages | Date | Thu, 24 Sep 2015 17:50:55 +0300 |
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SL*B uses compound pages and marks head pages with PG_slab. __SetPageSlab() and __ClearPageSlab() are never called for tail pages.
The same situation with PG_slob_free in SLOB allocator.
PF_NO_TAIL is appropriate for these flags.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- include/linux/page-flags.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 10b75615ddf2..c9cd82310e2d 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -254,7 +254,8 @@ PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD) PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD) PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD) TESTCLEARFLAG(Active, active, PF_HEAD) -__PAGEFLAG(Slab, slab, PF_ANY) +__PAGEFLAG(Slab, slab, PF_NO_TAIL) +__PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL) PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */ PAGEFLAG(Pinned, pinned, PF_ANY) TESTSCFLAG(Pinned, pinned, PF_ANY) /* Xen */ PAGEFLAG(SavePinned, savepinned, PF_ANY); /* Xen */ @@ -264,8 +265,6 @@ PAGEFLAG(SwapBacked, swapbacked, PF_ANY) __CLEARPAGEFLAG(SwapBacked, swapbacked, PF_ANY) __SETPAGEFLAG(SwapBacked, swapbacked, PF_ANY) -__PAGEFLAG(SlobFree, slob_free, PF_ANY) - /* * Private page markings that may be used by the filesystem that owns the page * for its own purposes. -- 2.5.1
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