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authorJens Axboe <axboe@fb.com>2014-05-29 09:53:32 -0600
committerJens Axboe <axboe@fb.com>2014-05-29 09:53:32 -0600
commit05f1dd5315217398fc8d122bdee80f96a9f21274 (patch)
treef1decfafa5f0d974d2f9c707a514bf68b9e2cddb /include/linux/rpmsg.h
parent4d92a9beb39d80a7d8ff7c04ae12a10290105ae5 (diff)
block: add queue flag for disabling SG merging
If devices are not SG starved, we waste a lot of time potentially collapsing SG segments. Enough that 1.5% of the CPU time goes to this, at only 400K IOPS. Add a queue flag, QUEUE_FLAG_NO_SG_MERGE, which just returns the number of vectors in a bio instead of looping over all segments and checking for collapsible ones. Add a BLK_MQ_F_SG_MERGE flag so that drivers can opt-in on the sg merging, if they so desire. Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/rpmsg.h')
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