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| author | Eddy Tao <taoyuan_eddy@hotmail.com> | 2023-02-05 04:35:37 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-07 09:36:29 +0300 |
| commit | 15ea59a0e9bf0dce546b6fcab5b00af8b35b870d (patch) | |
| tree | 45007b7f95d095f80b10b53f1bb5a4c2cb7203bf /net/ethtool | |
| parent | bbe641866318b2693e2778862e3b8ed6ccd0843b (diff) | |
| download | linux-15ea59a0e9bf0dce546b6fcab5b00af8b35b870d.tar.xz | |
net: openvswitch: reduce cpu_used_mask memory
Use actual CPU number instead of hardcoded value to decide the size
of 'cpu_used_mask' in 'struct sw_flow'. Below is the reason.
'struct cpumask cpu_used_mask' is embedded in struct sw_flow.
Its size is hardcoded to CONFIG_NR_CPUS bits, which can be
8192 by default, it costs memory and slows down ovs_flow_alloc.
To address this:
Redefine cpu_used_mask to pointer.
Append cpumask_size() bytes after 'stat' to hold cpumask.
Initialization cpu_used_mask right after stats_last_writer.
APIs like cpumask_next and cpumask_set_cpu never access bits
beyond cpu count, cpumask_size() bytes of memory is enough.
Signed-off-by: Eddy Tao <taoyuan_eddy@hotmail.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Link: https://lore.kernel.org/r/OS3P286MB229570CCED618B20355D227AF5D59@OS3P286MB2295.JPNP286.PROD.OUTLOOK.COM
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ethtool')
0 files changed, 0 insertions, 0 deletions