On Fri, Nov 06, 2020 at 03:50:22PM +0800, Alex Shi wrote: > From 6c142eb582e7d0dbf473572ad092eca07ab75221 Mon Sep 17 00:00:00 2001 > From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> > Date: Tue, 26 May 2020 17:31:15 +0800 > Subject: [PATCH v21 18/19] mm/lru: introduce the relock_page_lruvec function > > Use this new function to replace repeated same code, no func change. > > When testing for relock we can avoid the need for RCU locking if we simply > compare the page pgdat and memcg pointers versus those that the lruvec is > holding. By doing this we can avoid the extra pointer walks and accesses of > the memory cgroup. > > In addition we can avoid the checks entirely if lruvec is currently NULL. > > Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> > Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> > Acked-by: Hugh Dickins <hughd@xxxxxxxxxx> > Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: Tejun Heo <tj@xxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: cgroups@xxxxxxxxxxxxxxx > Cc: linux-mm@xxxxxxxxx Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
