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 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
