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authorAndi Kleen <andi@firstfloor.org>2009-09-16 05:50:10 -0400
committerAndi Kleen <ak@linux.intel.com>2009-09-16 05:50:10 -0400
commit14fa31b89c5ae79e4131da41761378a6df674352 (patch)
treec6c79e89e0aa0b2efeaf657d4715250a406ab699 /include
parenta6e04aa92965565968573a220a35b4e907385697 (diff)
HWPOISON: Use bitmask/action code for try_to_unmap behaviour
try_to_unmap currently has multiple modi (migration, munlock, normal unmap) which are selected by magic flag variables. The logic is not very straight forward, because each of these flag change multiple behaviours (e.g. migration turns off aging, not only sets up migration ptes etc.) Also the different flags interact in magic ways. A later patch in this series adds another mode to try_to_unmap, so this becomes quickly unmanageable. Replace the different flags with a action code (migration, munlock, munmap) and some additional flags as modifiers (ignore mlock, ignore aging). This makes the logic more straight forward and allows easier extension to new behaviours. Change all the caller to declare what they want to do. This patch is supposed to be a nop in behaviour. If anyone can prove it is not that would be a bug. Cc: Lee.Schermerhorn@hp.com Cc: npiggin@suse.de Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/rmap.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 8dff2ffab82c..4c4a2d4d289e 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -85,7 +85,18 @@ static inline void page_dup_rmap(struct page *page, struct vm_area_struct *vma,
85 */ 85 */
86int page_referenced(struct page *, int is_locked, 86int page_referenced(struct page *, int is_locked,
87 struct mem_cgroup *cnt, unsigned long *vm_flags); 87 struct mem_cgroup *cnt, unsigned long *vm_flags);
88int try_to_unmap(struct page *, int ignore_refs); 88enum ttu_flags {
89 TTU_UNMAP = 0, /* unmap mode */
90 TTU_MIGRATION = 1, /* migration mode */
91 TTU_MUNLOCK = 2, /* munlock mode */
92 TTU_ACTION_MASK = 0xff,
93
94 TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */
95 TTU_IGNORE_ACCESS = (1 << 9), /* don't age */
96};
97#define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
98
99int try_to_unmap(struct page *, enum ttu_flags flags);
89 100
90/* 101/*
91 * Called from mm/filemap_xip.c to unmap empty zero page 102 * Called from mm/filemap_xip.c to unmap empty zero page