Messages in this thread | | | Date | Thu, 24 May 2012 10:52:35 -0400 (EDT) | From | Alan Stern <> | Subject | Re: [RFC v2 PATCH 2/4] block: add queue runtime pm callbacks |
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On Thu, 24 May 2012, Lin Ming wrote:
> > When tested the patches, I found that kjournald and flusher thread > > frequently resume the disk. > > Just found that it's because "printk". > > When disk is suspended, it prints out some message, for example, > > [ 670.597103] sd 0:0:0:0: [sda] Synchronizing SCSI cache > [ 670.597827] sd 0:0:0:0: [sda] Stopping disk > > Then syslogd is waken up to write the log. > So disk is resumed right after suspended.
:-) Very amusing! So if you change those two messages in sd_suspend (and maybe also the message in sd_resume) from KERN_NOTICE to KERN_DEBUG, things ought to improve.
Alan Stern
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