From: Christoph Hellwig <hch@infradead.org>
To: Yuwen Chen <ywen.chen@foxmail.com>
Cc: tytso@mit.edu, adilger.kernel@dilger.ca, jaegeuk@kernel.org,
chao@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] f2fs: improve the performance of f2fs_lookup
Date: Thu, 3 Jul 2025 01:56:22 -0700 [thread overview]
Message-ID: <aGZFtmIxHDLKL6mc@infradead.org> (raw)
In-Reply-To: <tencent_0D8BB6ABAB0880DB7BFCCE35EDBC3DCFF505@qq.com>
On Thu, Jul 03, 2025 at 04:21:30PM +0800, Yuwen Chen wrote:
> On the Android system, the file creation operation will call
> the f2fs_lookup function. When there are too many files in a
> directory, the generic_ci_match operation will be called
> repeatedly in large quantities. In extreme cases, the file
> creation speed will drop to three times per second.
This files to explain what you are changing in detail, and why
(except for the very highlevel problem statement here).
>
> Signed-off-by: Yuwen Chen <ywen.chen@foxmail.com>
> ---
> fs/ext4/namei.c | 2 +-
> fs/f2fs/dir.c | 24 +++++++++++++++++-------
> fs/f2fs/f2fs.h | 3 ++-
> fs/f2fs/inline.c | 3 ++-
> fs/libfs.c | 32 +++++++++++++++++++++++++++++---
> include/linux/fs.h | 8 +++++++-
Also please split generic infrastructure changes from f2fs ones.
next prev parent reply other threads:[~2025-07-03 8:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-03 8:21 [PATCH] f2fs: improve the performance of f2fs_lookup Yuwen Chen
2025-07-03 8:56 ` Christoph Hellwig [this message]
2025-07-04 2:43 ` [PATCH v3 1/2] libfs: reduce the number of memory allocations in generic_ci_match Yuwen Chen
2025-07-04 6:02 ` Eric Biggers
2025-07-07 5:27 ` Christoph Hellwig
2025-07-08 7:11 ` Yuwen Chen
[not found] ` <tencent_3B7E5FEB5DB445A5DC50E3F3AE4DE72A7908@qq.com>
2025-07-08 9:40 ` 回复： " Christoph Hellwig
2025-07-04 2:44 ` [PATCH v3 2/2] f2fs: improve the performance of f2fs_lookup Yuwen Chen
2025-07-03 9:54 ` [PATCH v2] " Yuwen Chen
2025-07-08 6:41 ` [PATCH v4 1/2] libfs: reduce the number of memory allocations in generic_ci_match Yuwen Chen
2025-07-09 2:42 ` [PATCH] f2fs: improve the performance of f2fs_lookup kernel test robot
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