On Wed, Feb 22, 2017 at 10:50:39AM -0800, Shaohua Li wrote:
> Johannes pointed out TTU_LZFREE is unnecessary. It's true because we
> always have the flag set if we want to do an unmap. For cases we don't
> do an unmap, the TTU_LZFREE part of code should never run.
>
> Also the TTU_UNMAP is unnecessary. If no other flags set (for
> example, TTU_MIGRATION), an unmap is implied.
>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Suggested-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> Signed-off-by: Shaohua Li <shli@xxxxxx>
Thanks!
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> @@ -83,10 +83,8 @@ struct anon_vma_chain {
> };
>
> enum ttu_flags {
> - TTU_UNMAP = 1, /* unmap mode */
> 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 */
This on top?
---
Subject: [PATCH] mm: delete unnecessary TTU_* flags fix
Clean up the TTU flags a bit. Remove dead TTU_ACTION macro.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 70ef7536c088..640214bc4635 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -82,17 +82,17 @@ struct anon_vma_chain {
};
enum ttu_flags {
- TTU_MIGRATION = 2, /* migration mode */
- TTU_MUNLOCK = 4, /* munlock 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 */
- TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */
- TTU_BATCH_FLUSH = (1 << 11), /* Batch TLB flushes where possible
+ TTU_MIGRATION = 0x1, /* migration mode */
+ TTU_MUNLOCK = 0x2, /* munlock mode */
+
+ TTU_SPLIT_HUGE_PMD = 0x4, /* split huge PMD if any */
+ TTU_IGNORE_MLOCK = 0x8, /* ignore mlock */
+ TTU_IGNORE_ACCESS = 0x10, /* don't age */
+ TTU_IGNORE_HWPOISON = 0x20, /* corrupted page is recoverable */
+ TTU_BATCH_FLUSH = 0x40, /* 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:
+ TTU_RMAP_LOCKED = 0x80 /* do not grab rmap lock:
* caller holds it */
};
@@ -182,8 +182,6 @@ static inline void page_dup_rmap(struct page *page, bool compound)
int page_referenced(struct page *, int is_locked,
struct mem_cgroup *memcg, unsigned long *vm_flags);
-#define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
-
int try_to_unmap(struct page *, enum ttu_flags flags);
/*
--
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