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From: Jan Ziak <0xe2.0x9a.0x9b@gmail.com>
To: gregkh@linuxfoundation.org
Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-man@vger.kernel.org, mtk.manpages@gmail.com,
	shuah@kernel.org, viro@zeniv.linux.org.uk
Subject: Re: [PATCH 0/3] readfile(2): a new syscall to make open/read/close faster
Date: Sun, 5 Jul 2020 04:06:22 +0200	[thread overview]
Message-ID: <CAODFU0q6CrUB_LkSdrbp5TQ4Jm6Sw=ZepZwD-B7-aFudsOvsig@mail.gmail.com> (raw)

Hello

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.

Without the ability to read multiple small files using a single system
call, it is impossible to increase IOPS (unless an application is
using multiple reader threads or somehow instructs the kernel to
prefetch multiple files into memory).

While you are at it, why not also add a readfiles system call to read
multiple, presumably small, files? The initial unoptimized
implementation of readfiles syscall can simply call readfile
sequentially.

Sincerely
Jan (atomsymbol)

             reply	other threads:[~2020-07-05  2:07 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-05  2:06 Jan Ziak [this message]
2020-07-05  2:16 ` Matthew Wilcox
2020-07-05  2:46   ` Jan Ziak
2020-07-05  3:12     ` Matthew Wilcox
2020-07-05  3:18       ` Jan Ziak
2020-07-05  3:27         ` Matthew Wilcox
2020-07-05  4:09           ` Jan Ziak
2020-07-05 11:58             ` Greg KH
2020-07-06  6:07               ` Jan Ziak
2020-07-06 11:11                 ` Matthew Wilcox
2020-07-06 11:18                 ` Greg KH
2020-07-05  8:07           ` Vito Caputo
2020-07-05 11:44             ` Greg KH
2020-07-05 20:34               ` Vito Caputo
2020-07-05  6:32     ` Andreas Dilger
2020-07-05  7:25       ` Jan Ziak
2020-07-05 12:00         ` Greg KH
2020-07-05 11:50 ` Greg KH
2020-07-14  6:51   ` Pavel Machek
2020-07-14  8:07     ` Miklos Szeredi
2020-07-14 11:34       ` Pavel Begunkov
2020-07-14 11:55         ` Miklos Szeredi
2020-07-15  8:31           ` Pavel Begunkov
2020-07-15  8:41             ` Miklos Szeredi
2020-07-15  8:49               ` Pavel Begunkov
2020-07-15  9:00                 ` Pavel Begunkov
2020-07-15 11:17                   ` Miklos Szeredi
  -- strict thread matches above, loose matches on Subject: below --
2020-07-04 14:02 Greg Kroah-Hartman
2020-07-04 19:30 ` Al Viro
2020-07-05 11:47   ` Greg Kroah-Hartman
2020-07-06 17:25 ` Dave Martin

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