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authorMikulas Patocka <mpatocka@redhat.com>2020-04-29 19:30:03 +0300
committerMike Snitzer <snitzer@redhat.com>2020-05-15 17:29:36 +0300
commit48338daaa00e6137a43fa5d0e54b763aa34f450b (patch)
tree8a3b7250121a73df9de065be338d582f192c9632 /drivers/md/dm-mpath.c
parent499c18045eab16656ef4159c35b05865038f9f25 (diff)
downloadlinux-48338daaa00e6137a43fa5d0e54b763aa34f450b.tar.xz
dm writecache: improve performance on DDR persistent memory (Optane)
When testing the dm-writecache target on a real DDR persistent memory (Intel Optane), it turned out that explicit cache flushing using the clflushopt instruction performs better than non-temporal stores for block sizes 1k, 2k and 4k. The dm-writecache target is singlethreaded (all the copying is done while holding the writecache lock), so it benefits from clwb, see: http://lore.kernel.org/r/alpine.LRH.2.02.2004160411460.7833@file01.intranet.prod.int.rdu2.redhat.com Add a new function memcpy_flushcache_optimized() that tests if clflushopt is present - and if it is, we use it instead of memcpy_flushcache. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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