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| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-06-30 18:52:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-30 20:47:31 -0700 |
| commit | ae34af1f11d0a6ae849b7605d15df9798dab7b46 (patch) | |
| tree | fb7b66c2d0f61e59121cbf7609c2f9a6f1251e87 /mm | |
| parent | 2c1e9a2c668b4606e9c27fe420ddf83d113928c8 (diff) | |
| download | linux-ae34af1f11d0a6ae849b7605d15df9798dab7b46.tar.gz | |
mm/zswap.c: avoid unnecessary copy-in at map time
The buf mapped via zpool_map_handle() is only used to store compressed page buffer and there is no information to extract from it. So we could use ZPOOL_MM_WO instead to avoid unnecessary copy-in at map time. Link: https://lkml.kernel.org/r/20210522092242.3233191-3-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Colin Ian King <colin.king@canonical.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Seth Jennings <sjenning@redhat.com> Cc: Tian Tao <tiantao6@hisilicon.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/zswap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/zswap.c b/mm/zswap.c index e93459319fdb..c27ce9f2cdf8 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -1203,7 +1203,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset, zswap_reject_alloc_fail++; goto put_dstmem; } - buf = zpool_map_handle(entry->pool->zpool, handle, ZPOOL_MM_RW); + buf = zpool_map_handle(entry->pool->zpool, handle, ZPOOL_MM_WO); memcpy(buf, &zhdr, hlen); memcpy(buf + hlen, dst, dlen); zpool_unmap_handle(entry->pool->zpool, handle); |