On Thu, 27 Nov 2014 09:39:56 +0800, Miao Xie wrote: > On Wed, 26 Nov 2014 10:02:23 -0500, Chris Mason wrote: >> On Wed, Nov 26, 2014 at 8:04 AM, Miao Xie <miaox@xxxxxxxxxxxxxx> wrote: >>> The increase/decrease of bio counter is on the I/O path, so we should >>> use io_schedule() instead of schedule(), or the deadlock might be >>> triggered by the pending I/O in the plug list. io_schedule() can help >>> us because it will flush all the pending I/O before the task is going >>> to sleep. >> >> Can you please describe this deadlock in more detail? schedule() also triggers >> a flush of the plug list, and if that's no longer sufficient we can run into other >> problems (especially with preemption on). > > Sorry for my miss. I forgot to check the current implementation of schedule(), which flushes the plug list unconditionally. Please ignore this patch. I have updated my raid56-scrub-replace branch, please re-pull the branch. https://github.com/miaoxie/linux-btrfs.git raid56-scrub-replace Thanks Miao > > Thanks > Miao > >> >> -chris >> >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
