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| author |   Mike Snitzer <snitzer@redhat.com> | 2017-10-19 17:16:54 -0400 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-11-10 15:44:47 -0500 |
| commit | 2df3bae9a6543e90042291707b8db0cbfbae9ee9 (patch) | |
| tree | c6f6fc8506e3d0cc38f882de23497f3961f70e4e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | dm cache: pass cache structure to mode functions (diff) | |
| download | linux-dev-2df3bae9a6543e90042291707b8db0cbfbae9ee9.tar.xz linux-dev-2df3bae9a6543e90042291707b8db0cbfbae9ee9.zip | |
dm cache: submit writethrough writes in parallel to origin and cache
Discontinue issuing writethrough write IO in series to the origin and
then cache.
Use bio_clone_fast() to create a new origin clone bio that will be
mapped to the origin device and then bio_chain() it to the bio that gets
remapped to the cache device. The origin clone bio does _not_ have a
copy of the per_bio_data -- as such check_if_tick_bio_needed() will not
be called.
The cache bio (parent bio) will not complete until the origin bio has
completed -- this fulfills bio_clone_fast()'s requirements as well as
the requirement to not complete the original IO until the write IO has
completed to both the origin and cache device.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions