From: Fengnan Chang <changfengnan@vivo.com>
To: jaegeuk@kernel.org, chao@kernel.org,
linux-f2fs-devel@lists.sourceforge.net
Cc: Fengnan Chang <changfengnan@vivo.com>
Subject: [f2fs-dev] [PATCH v4] f2fs: compress: avoid unnecessary check in f2fs_prepare_compress_overwrite
Date: Fri, 7 May 2021 17:44:54 +0800 [thread overview]
Message-ID: <20210507094455.1695-1-changfengnan@vivo.com> (raw)
when write compressed file with O_TRUNC, there will be a lot of
unnecessary check valid blocks in f2fs_prepare_compress_overwrite,
especially when written in page size, remove it.
This patch will not bring significant performance improvements, I test
this on mobile phone, use androbench, the sequential write test case was
open file with O_TRUNC, set write size to 4KB, performance improved
about 2%-3%. If write size set to 32MB, performance improved about 0.5%.
Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
---
fs/f2fs/data.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index cf935474ffba..b9ec7b182f45 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3303,9 +3303,17 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
#ifdef CONFIG_F2FS_FS_COMPRESSION
if (f2fs_compressed_file(inode)) {
int ret;
+ pgoff_t end = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
*fsdata = NULL;
+ /*
+ * when write pos is bigger than inode size ,f2fs_prepare_compress_overwrite
+ * always return 0, so check pos first to avoid this.
+ */
+ if (index >= end)
+ goto repeat;
+
ret = f2fs_prepare_compress_overwrite(inode, pagep,
index, fsdata);
if (ret < 0) {
--
2.29.0
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next reply other threads:[~2021-05-07 9:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 9:44 Fengnan Chang [this message]
2021-05-10 15:43 ` [f2fs-dev] [PATCH v4] f2fs: compress: avoid unnecessary check in f2fs_prepare_compress_overwrite Jaegeuk Kim
2021-05-11 11:10 ` [f2fs-dev] 答复: " changfengnan
2021-05-11 21:50 ` Jaegeuk Kim
2021-05-12 1:20 ` Gao Xiang
2021-05-12 1:52 ` Chao Yu
2021-05-13 1:41 ` [f2fs-dev] 答复: " changfengnan
2021-05-13 21:17 ` [f2fs-dev] " Eric Biggers
2021-05-14 1:15 ` Chao Yu
2021-05-17 21:18 ` Eric Biggers
2021-05-18 1:23 ` Chao Yu
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