linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: add a sysfs entry to reclaim POSIX_FADV

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Message-ID: <cdd5f34a-51dc-40f4-89f6-70179c7b738a@kernel.org>
Date: Thu, 13 Feb 2025 10:15:17 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Cc: chao@...nel.org
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: add a sysfs entry to reclaim
 POSIX_FADV_NOREUSE pages

On 2/12/25 10:31, Jaegeuk Kim via Linux-f2fs-devel wrote:
> 1. fadvise(fd1, POSIX_FADV_NOREUSE, {0,3});
> 2. fadvise(fd2, POSIX_FADV_NOREUSE, {1,2});
> 3. fadvise(fd3, POSIX_FADV_NOREUSE, {3,1});
> 4. echo 1024 > /sys/fs/f2fs/tuning/reclaim_caches_kb
> 
> This gives a way to reclaim file-backed pages by iterating all f2fs mounts until
> reclaiming 1MB page cache ranges, registered by #1, #2, and #3.
> 
> 5. cat /sys/fs/f2fs/tuning/reclaim_caches_kb
> -> gives total number of registered file ranges.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,