fs/buffer.c: add checking buffer head stat before clear
mainline inclusion from mainline-v5.12-rc1 commit 4ebd3aec3842662300979dacd6fb38e3e8edf7f4 category: performance bugzilla: NA CVE: NA -------------------------------- clear_buffer_new() is used to clear buffer new stat. When PAGE_SIZE is 64K, most buffer heads in the list are not needed to clear. clear_buffer_new() has an enpensive atomic modification operation, Let's add checking buffer head before clear it as __block_write_begin_int does which is good for performance. Link: https://lkml.kernel.org/r/1612332890-57918-1-git-send-email-zhangshaokun@hisilicon.com Signed-off-by:Yang Guo <guoyang2@huawei.com> Signed-off-by:
Shaokun Zhang <zhangshaokun@hisilicon.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Yang Yingliang <yangyingliang@huawei.com> Reviewed-by:
Zhang Yi <yi.zhang@h...>
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