lkml.org 
[lkml]   [2023]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [ovs-dev] [PATCH net-next v8 1/1] net: openvswitch: reduce cpu_used_mask memory
Date


On 5 Feb 2023, at 2:35, Eddy Tao wrote:

> 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>

The changes look good to me. Hopefully this is the last revision ;)

Acked-by: Eelco Chaudron <echaudro@redhat.com>

\
 
 \ /
  Last update: 2023-03-27 00:10    [W:0.050 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site