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author | Nicholas Bellinger <nab@daterainc.com> | 2013-09-23 12:12:42 -0700 |
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committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-10-01 21:40:55 -0700 |
commit | 5f544cfac956971099e906f94568bc3fd1a7108a (patch) | |
tree | 01693c400aeae3cf1fbaf26b54f7b55e083387d3 /lib/percpu_ida.c | |
parent | 15c03dd4859ab16f9212238f29dd315654aa94f6 (diff) | |
download | linux-5f544cfac956971099e906f94568bc3fd1a7108a.tar.bz2 |
tcm_fc: Convert to per-cpu command map pre-allocation of ft_cmd
This patch converts tcm_fc to use transport_init_session_tags()
pre-allocation logic for struct ft_cmd descriptors using per-cpu
session tag pooling in order to effectively avoid memory allocation
+ release for each received I/O.
It adds percpu_ida_alloc() in ft_recv_cmd() to obtain an tag and
locate ft_cmd from se_sess->sess_cmd_map[], and percpu_ida_free()
in ft_free_cmd() to release the tag based upon se_cmd->map_tag id.
It also uses a TCM_FC_DEFAULT_TAGS value of 512, that puts the
per se_sess->sess_cmd_map allocation at ~360K on 64-bit.
v2 changes:
- Handle possible tag < 0 failure with GFP_ATOMIC
Cc: Mark Rustad <mark.d.rustad@intel.com>
Cc: Robert Love <robert.w.love@intel.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
Diffstat (limited to 'lib/percpu_ida.c')
0 files changed, 0 insertions, 0 deletions