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| author |   Nicholas Bellinger <nab@daterainc.com> | 2013-09-23 12:12:42 -0700 |
|---|---|---|
| committer |   Nicholas Bellinger <nab@linux-iscsi.org> | 2013-10-01 21:40:55 -0700 |
| commit | 5f544cfac956971099e906f94568bc3fd1a7108a (patch) | |
| tree | 01693c400aeae3cf1fbaf26b54f7b55e083387d3 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | Linux 3.12-rc3 (diff) | |
| download | linux-dev-5f544cfac956971099e906f94568bc3fd1a7108a.tar.xz linux-dev-5f544cfac956971099e906f94568bc3fd1a7108a.zip | |
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 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions