Bug 456027 – readahead should use O_NOATIME while opening the files

Bug 456027 - readahead should use O_NOATIME while opening the files

Summary:	readahead should use O_NOATIME while opening the files

Status:	CLOSED RAWHIDE

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	readahead (Show other bugs)
Sub Component:
Version:	rawhide
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Karel Zak
QA Contact:	Fedora Extras Quality Assurance
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Reported:	2008-07-20 19:54 EDT by Arjan van de Ven
Modified:	2008-07-22 04:13 EDT (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2008-07-22 04:13:41 EDT
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Description Arjan van de Ven 2008-07-20 19:54:59 EDT

Description of problem:

the readahead program currently doesn't use O_NOATIME while opening the files to
read ahead... this has 2 effects
1) the atime changes, potentially impacting backup and other tools that think
files are used more than they maybe are
2) about 5 seconds afterwards, kjournald starts writing the new dirty inodes out
to disk, slowing things down unneeded.

Fix is easy, just add "| O_NOATIME" to the open flags...

Comment 1 Karel Zak 2008-07-21 04:13:07 EDT

Ah... excellent idea. Thanks.

Comment 2 Karel Zak 2008-07-22 04:13:41 EDT

Fixed in upstream, rawhide and F-9.

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