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| author |   Matthew Wilcox <willy@infradead.org> | 2018-06-12 12:05:44 -0700 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2018-06-19 22:02:25 -0400 |
| commit | 10e9cbb6b531117be0c4a79f2c7fa9a45a0dd532 (patch) | |
| tree | ea333b10d3aa71849264ab3fe6147b0e0d4420da /drivers/target/target_core_transport.c | |
| parent | scsi: target: Abstract tag freeing (diff) | |
| download | linux-dev-10e9cbb6b531117be0c4a79f2c7fa9a45a0dd532.tar.xz linux-dev-10e9cbb6b531117be0c4a79f2c7fa9a45a0dd532.zip | |
scsi: target: Convert target drivers to use sbitmap
The sbitmap and the percpu_ida perform essentially the same task,
allocating tags for commands. The sbitmap outperforms the percpu_ida as
documented here: https://lkml.org/lkml/2014/4/22/553
The sbitmap interface is a little harder to use, but being able to remove
the percpu_ida code and getting better performance justifies the additional
complexity.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> # f_tcm
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target/target_core_transport.c')
| -rw-r--r-- | drivers/target/target_core_transport.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index ee5081ba5313..89dd475d0a8f 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -260,7 +260,8 @@ int transport_alloc_session_tags(struct se_session *se_sess, } } - rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); + rc = sbitmap_queue_init_node(&se_sess->sess_tag_pool, tag_num, -1, + false, GFP_KERNEL, NUMA_NO_NODE); if (rc < 0) { pr_err("Unable to init se_sess->sess_tag_pool," " tag_num: %u\n", tag_num); @@ -547,7 +548,7 @@ void transport_free_session(struct se_session *se_sess) target_put_nacl(se_nacl); } if (se_sess->sess_cmd_map) { - percpu_ida_destroy(&se_sess->sess_tag_pool); + sbitmap_queue_free(&se_sess->sess_tag_pool); kvfree(se_sess->sess_cmd_map); } kmem_cache_free(se_sess_cache, se_sess); |