From: Greg KH <gregkh@linuxfoundation.org>
To: Miklos Szeredi <mszeredi@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, linux-man@vger.kernel.org,
linux-security-module@vger.kernel.org,
Karel Zak <kzak@redhat.com>, Ian Kent <raven@themaw.net>,
David Howells <dhowells@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <christian@brauner.io>,
Amir Goldstein <amir73il@gmail.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>
Subject: Re: [RFC PATCH] getvalues(2) prototype
Date: Wed, 23 Mar 2022 08:16:41 +0100 [thread overview]
Message-ID: <YjrJWf+XMnWVd6K0@kroah.com> (raw)
In-Reply-To: <20220322192712.709170-1-mszeredi@redhat.com>
On Tue, Mar 22, 2022 at 08:27:12PM +0100, Miklos Szeredi wrote:
> Add a new userspace API that allows getting multiple short values in a
> single syscall.
>
> This would be useful for the following reasons:
>
> - Calling open/read/close for many small files is inefficient. E.g. on my
> desktop invoking lsof(1) results in ~60k open + read + close calls under
> /proc and 90% of those are 128 bytes or less.
As I found out in testing readfile():
https://lore.kernel.org/r/20200704140250.423345-1-gregkh@linuxfoundation.org
microbenchmarks do show a tiny improvement in doing something like this,
but that's not a real-world application.
Do you have anything real that can use this that shows a speedup?
thanks,
greg k-h
next prev parent reply other threads:[~2022-03-23 7:16 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-22 19:27 [RFC PATCH] getvalues(2) prototype Miklos Szeredi
2022-03-22 19:30 ` Miklos Szeredi
2022-03-22 20:36 ` Casey Schaufler
2022-03-22 20:53 ` Casey Schaufler
2022-03-23 7:14 ` Greg KH
2022-03-23 7:16 ` Greg KH [this message]
2022-03-23 10:26 ` Bernd Schubert
2022-03-23 11:42 ` Greg KH
2022-03-23 12:06 ` Bernd Schubert
2022-03-23 12:13 ` Greg KH
2022-03-23 19:29 ` J. Bruce Fields
2022-03-23 11:42 ` Christian Brauner
2022-03-23 13:24 ` Miklos Szeredi
2022-03-23 13:38 ` Greg KH
2022-03-23 15:23 ` Miklos Szeredi
2022-03-24 6:56 ` Greg KH
2022-03-23 13:51 ` Casey Schaufler
2022-03-23 14:00 ` Miklos Szeredi
2022-03-23 22:39 ` Casey Schaufler
2022-03-23 22:19 ` Theodore Ts'o
2022-03-24 6:34 ` Christoph Hellwig
2022-03-24 8:44 ` Miklos Szeredi
2022-03-24 16:15 ` Eric W. Biederman
2022-03-25 8:46 ` Karel Zak
2022-03-25 8:54 ` Greg KH
2022-03-25 9:25 ` Karel Zak
2022-03-26 4:19 ` Theodore Ts'o
2022-03-25 18:40 ` Linus Torvalds
2022-03-25 11:02 ` Cyril Hrubis
2022-03-23 22:58 ` Dave Chinner
2022-03-23 23:17 ` Casey Schaufler
2022-03-24 8:57 ` Miklos Szeredi
2022-03-24 10:34 ` Amir Goldstein
2022-03-24 20:31 ` Dave Chinner
2022-03-25 9:10 ` Karel Zak
2022-03-25 16:42 ` Trond Myklebust
2022-03-27 21:03 ` Dave Chinner
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