From mboxrd@z Thu Jan 1 00:00:00 1970 From: jszhang@marvell.com (Jisheng Zhang) Date: Tue, 18 Oct 2016 19:21:49 +0800 Subject: [RFC] reduce latency in __purge_vmap_area_lazy In-Reply-To: <1476773771-11470-1-git-send-email-hch@lst.de> References: <1476773771-11470-1-git-send-email-hch@lst.de> Message-ID: <20161018192149.3de86109@xhacker> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, 18 Oct 2016 08:56:05 +0200 Christoph Hellwig wrote: > Hi all, > > this is my spin at sorting out the long lock hold times in > __purge_vmap_area_lazy. It is based on the patch from Joel sent this > week. I don't have any good numbers for it, but it survived an > xfstests run on XFS which is a significant vmalloc user. The > changelogs could still be improved as well, but I'd rather get it > out quickly for feedback and testing. I just tested this series, the preempt off ftrace log doesn't complain __purge_vmap_area_lazy any more in my test case, this latency is removed! So feel free to add Tested-by: Jisheng Zhang