From: Li Wang <liwang@ubuntukylin.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Sage Weil <sage@inktank.com>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>,
Yunchuan Wen <yunchuanwen@ubuntukylin.com>
Subject: Re: [PATCH 0/5] VFS: Directory level cache cleaning
Date: Tue, 17 Dec 2013 11:08:16 +0800 [thread overview]
Message-ID: <52AFC020.10403@ubuntukylin.com> (raw)
In-Reply-To: <CAM_iQpUSX1yX9SMvUnbwZ7UkaBMUheOEiZNaSb4m8gWBQzzGDQ@mail.gmail.com>
As far as we know, fadvise(DONTNEED) does not support metadata
cache cleaning. We think that is desirable under massive small files
situations. Another thing is that do people accept the behavior
of feeding a directory fd to fadvise will recusively clean all
page caches of files inside that directory?
On 2013/12/17 1:45, Cong Wang wrote:
> On Mon, Dec 16, 2013 at 7:00 AM, Li Wang <liwang@ubuntukylin.com> wrote:
>> This patch extend the 'drop_caches' interface to
>> support directory level cache cleaning and has a complete
>> backward compatibility. '{1,2,3}' keeps the same semantics
>> as before. Besides, "{1,2,3}:DIRECTORY_PATH_NAME" is allowed
>> to recursively clean the caches under DIRECTORY_PATH_NAME.
>> For example, 'echo 1:/home/foo/jpg > /proc/sys/vm/drop_caches'
>> will clean the page caches of the files inside 'home/foo/jpg'.
>>
>
> This interface is ugly...
>
> And we already have a file-level drop cache, that is,
> fadvise(DONTNEED). Can you extend it if it can't
> handle a directory fd?
>
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WARNING: multiple messages have this Message-ID (diff)
From: Li Wang <liwang@ubuntukylin.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Sage Weil <sage@inktank.com>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>,
Yunchuan Wen <yunchuanwen@ubuntukylin.com>
Subject: Re: [PATCH 0/5] VFS: Directory level cache cleaning
Date: Tue, 17 Dec 2013 11:08:16 +0800 [thread overview]
Message-ID: <52AFC020.10403@ubuntukylin.com> (raw)
In-Reply-To: <CAM_iQpUSX1yX9SMvUnbwZ7UkaBMUheOEiZNaSb4m8gWBQzzGDQ@mail.gmail.com>
As far as we know, fadvise(DONTNEED) does not support metadata
cache cleaning. We think that is desirable under massive small files
situations. Another thing is that do people accept the behavior
of feeding a directory fd to fadvise will recusively clean all
page caches of files inside that directory?
On 2013/12/17 1:45, Cong Wang wrote:
> On Mon, Dec 16, 2013 at 7:00 AM, Li Wang <liwang@ubuntukylin.com> wrote:
>> This patch extend the 'drop_caches' interface to
>> support directory level cache cleaning and has a complete
>> backward compatibility. '{1,2,3}' keeps the same semantics
>> as before. Besides, "{1,2,3}:DIRECTORY_PATH_NAME" is allowed
>> to recursively clean the caches under DIRECTORY_PATH_NAME.
>> For example, 'echo 1:/home/foo/jpg > /proc/sys/vm/drop_caches'
>> will clean the page caches of the files inside 'home/foo/jpg'.
>>
>
> This interface is ugly...
>
> And we already have a file-level drop cache, that is,
> fadvise(DONTNEED). Can you extend it if it can't
> handle a directory fd?
>
next prev parent reply other threads:[~2013-12-17 3:08 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 15:00 [PATCH 0/5] VFS: Directory level cache cleaning Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` [PATCH 1/5] VFS: Convert drop_caches to accept string Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` [PATCH 2/5] VFS: Convert sysctl_drop_caches to string Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` [PATCH 3/5] VFS: Add the declaration of shrink_pagecache_parent Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` [PATCH 4/5] VFS: Add shrink_pagecache_parent Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 15:00 ` [PATCH 5/5] VFS: Extend drop_caches sysctl handler to allow directory level cache cleaning Li Wang
2013-12-16 15:00 ` Li Wang
2013-12-16 17:45 ` [PATCH 0/5] VFS: Directory " Cong Wang
2013-12-16 17:45 ` Cong Wang
2013-12-17 3:08 ` Li Wang [this message]
2013-12-17 3:08 ` Li Wang
2013-12-17 3:58 ` Matthew Wilcox
2013-12-17 7:23 ` Li Wang
2013-12-17 7:23 ` Li Wang
2013-12-17 9:12 ` Li Zefan
2013-12-17 9:12 ` Li Zefan
2013-12-17 9:12 ` Li Zefan
2013-12-17 9:31 ` Li Wang
2013-12-17 9:31 ` Li Wang
2013-12-18 1:26 ` Li Zefan
2013-12-18 1:26 ` Li Zefan
2013-12-18 1:26 ` Li Zefan
2013-12-17 13:55 ` Michal Hocko
2013-12-17 13:55 ` Michal Hocko
2013-12-17 22:05 ` Dave Chinner
2013-12-17 22:05 ` Dave Chinner
2013-12-17 22:05 ` Dave Chinner
2013-12-18 1:36 ` Li Wang
2013-12-18 1:36 ` Li Wang
2013-12-18 1:36 ` Li Wang
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