aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/scripts/python/check-perf-trace.py
diff options
context:
space:
mode:
authorLiu Bo <bo.li.liu@oracle.com>2018-01-12 18:07:02 -0700
committerDavid Sterba <dsterba@suse.com>2018-01-22 16:08:21 +0100
commit44ac474def527a9c595a88400f4717dacae03b8a (patch)
treebde3b88d6fa242c6667007f3c8a6e7afd705a064 /tools/perf/scripts/python/check-perf-trace.py
parent0198e5b707cfeb5defbd1b71b1ec6e71580d7db9 (diff)
Btrfs: do not cache rbio pages if using raid6 recover
Since raid6 recover tries all possible combinations of failed stripes, - when raid6 rebuild algorithm is used, i.e. raid6_datap_recov() and raid6_2data_recov(), it may change the in-memory content of failed stripes, if such a raid bio is cached, a later raid write rmw or recover can steal @stripe_pages from it instead of reading from disks, such that it carries the wrong content to do write rmw or recovery and ends up with corruption or recovery failures. - when raid5 rebuild algorithm is used, i.e. xor, raid bio can be cached because the only failed stripe which contains @rbio->bio_pages gets modified, others remain the same so that their in-memory content is consistent with their on-disk content. This adds a check to skip caching rbio if using raid6 recover. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions