linux-kernel - reduce latency in __purge_vmap_area

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Message-Id: <1479474236-4139-1-git-send-email-hch@lst.de>
Date:   Fri, 18 Nov 2016 14:03:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     akpm@...ux-foundation.org
Cc:     aryabinin@...tuozzo.com, joelaf@...gle.com, jszhang@...vell.com,
        chris@...is-wilson.co.uk, joaodias@...gle.com, linux-mm@...ck.org,
        linux-rt-users@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: reduce latency in __purge_vmap_area_lazy V2

Hi all,

this is my spin at sorting out the long lock hold times in
__purge_vmap_area_lazy.  It is based on a patch from Joel.

Changes since V1:
 - add vfree_atomic, thanks to Andrey Ryabinin.