Bug 821697

Summary: [2.5 File system determinism tips] bdflush(2) is obsolete syscall
Product: Red Hat Enterprise MRG Reporter: Kazuo Moriwaka <kmoriwak>
Component: Realtime_Tuning_GuideAssignee: Cheryn Tan <chetan>
Status: CLOSED CURRENTRELEASE QA Contact: ecs-bugs
Severity: low Docs Contact:
Priority: unspecified    
Version: 2.1CC: jskeoch, lgoncalv, rlandman
Target Milestone: 2.2   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2012-09-20 02:38:45 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Blocks: 795209    

Description Kazuo Moriwaka 2012-05-15 11:08:35 UTC 
Description of problem:

bdflush(2) is introduced as related man pages, but this syscall is obsolete and man pages don't say about the situation.

This may cause some useless time in tuning process.  Please remove the reference or add some notes like "this system call is obsolete and calling it is ignored, but this man pages is informative for understanding kernel behaviour."  

Version-Release number of selected component (if applicable):


How reproducible:


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Additional info:

in linux/fs/buffer.c: 
-----------------------------------
/*
 * There are no bdflush tunables left.  But distributions are
 * still running obsolete flush daemons, so we terminate them here.
 *
 * Use of bdflush() is deprecated and will be removed in a future kernel.
 * The `flush-X' kernel threads fully replace bdflush daemons and this call.
 */
SYSCALL_DEFINE2(bdflush, int, func, long, data)
{
-----------------------------------
Comment 3 Cheryn Tan 2012-09-20 02:38:45 UTC 
Released for MRG 2.2.