linux-kernel - Re: [PATCH 0/3] readfile(2): a new syscall to make open/read/close faster

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Message-ID: <20200714065110.GA8047@amd>
Date:   Tue, 14 Jul 2020 08:51:10 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Jan Ziak <0xe2.0x9a.0x9b@...il.com>, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-man@...r.kernel.org,
        mtk.manpages@...il.com, shuah@...nel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH 0/3] readfile(2): a new syscall to make open/read/close
 faster

Hi!

> > At first, I thought that the proposed system call is capable of
> > reading *multiple* small files using a single system call - which
> > would help increase HDD/SSD queue utilization and increase IOPS (I/O
> > operations per second) - but that isn't the case and the proposed
> > system call can read just a single file.
> 
> If you want to do this for multple files, use io_ring, that's what it
> was designed for.  I think Jens was going to be adding support for the
> open/read/close pattern to it as well, after some other more pressing
> features/fixes were finished.

What about... just using io_uring for single file, too? I'm pretty
sure it can be wrapped in a library that is simple to use, avoiding
need for new syscall.
							Pavel
							
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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