linux-kernel - reduce latency in __purge_vmap_area

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Date:   Sat, 22 Oct 2016 17:17:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     akpm@...ux-foundation.org
Cc:     joelaf@...gle.com, jszhang@...vell.com, chris@...is-wilson.co.uk,
        joaodias@...gle.com, linux-mm@...ck.org,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: reduce latency in __purge_vmap_area_lazy

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.