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Date: Sun, 26 Feb 2012 06:44:21 +0900 From: Tejun Heo <tj@...nel.org> To: Vivek Goyal <vgoyal@...hat.com> Cc: axboe@...nel.dk, hughd@...gle.com, avi@...hat.com, nate@...nel.net, cl@...ux-foundation.org, linux-kernel@...r.kernel.org, dpshah@...gle.com, ctalbott@...gle.com, rni@...gle.com, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCHSET] mempool, percpu, blkcg: fix percpu stat allocation and remove stats_lock Hello, Vivek. On Fri, Feb 24, 2012 at 09:20:33AM -0500, Vivek Goyal wrote: > Ok. I will write a patch. Things have changed a lot since last time. > I think there is only one tricky part and that is waiting for any > scheduled work to finish during blkg destruction. Because group destruction > happens under both queue and blkcg spin locks, I think I will have to take > the group off list, drop locks, wait for worker thread to finish and then > take locks again and walk through list again to kill remaining groups. Rather than embedding work_struct into blkg and tying work and blkg destruction, why not just create a spinlock protected alloc-pending list? On blkg creation, link blkg onto that list and kick shared work item and on destruction, just unlink it. Worker function can walk the list and try to alloc for all and reschedule if alloc fails. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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