Re: [PATCH] fs: drop_caches: skip dropping pagecache which is always dirty
From: Matthew Wilcox
Date: Tue Jul 19 2022 - 23:03:28 EST
On Wed, Jul 20, 2022 at 02:21:19AM +0000, cgel.zte@xxxxxxxxx wrote:
> From: Yang Yang <yang.yang29@xxxxxxxxxx>
>
> Pagecache of some kind of fs has PG_dirty bit set once it was
> allocated, so it can't be dropped. These fs include ramfs and
> tmpfs. This can make drop_pagecache_sb() more efficient.
Why do we want to make drop_pagecache_sb() more efficient?