summaryrefslogtreecommitdiff
path: root/lib/sg_pool.c
diff options
context:
space:
mode:
authorMing Lei <ming.lei@redhat.com>2019-06-06 16:34:10 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2019-06-20 15:21:33 -0400
commitee5a1dbfec57cc1ffdedf2bd767c84d5e0498ed8 (patch)
tree77dac02b6d46221a4e909842fdb175833a299853 /lib/sg_pool.c
parent0e9fdd2b315c0fde535336ea09499a927e415566 (diff)
scsi: esp: use sg helper to iterate over scatterlist
Unlike the legacy I/O path, scsi-mq preallocates a large array to hold the scatterlist for each request. This static allocation can consume substantial amounts of memory on modern controllers which support a large number of concurrently outstanding requests. To facilitate a switch to a smaller static allocation combined with a dynamic allocation for requests that need it, we need to make sure all SCSI drivers handle chained scatterlists correctly. Convert remaining drivers that directly dereference the scatterlist array to using the iterator functions. [mkp: clarified commit message] Cc: Christoph Hellwig <hch@lst.de> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Ewan D. Milne <emilne@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Finn Thain <fthain@telegraphics.com.au> Cc: Guenter Roeck <linux@roeck-us.net> Reported-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'lib/sg_pool.c')
0 files changed, 0 insertions, 0 deletions