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13 June 2022, 11:31:42 UTC
Revision ab5cdc31630c7596d81ca8fbe7d695f10666f39b authored by Leon Romanovsky on 21 October 2015, 06:21:17 UTC, committed by Doug Ledford on 08 December 2015, 21:55:31 UTC 
IB/mlx5: Postpone remove_keys under knowledge of coming preemption
 
The remove_keys() logic is performed as garbage collection task. Such
task is intended to be run when no other active processes are running.

The need_resched() will return TRUE if there are user tasks to be
activated in near future.

In such case, we don't execute remove_keys() and postpone
the garbage collection work to try to run in next cycle,
in order to free CPU resources to other tasks.

The possible pseudo-code to trigger such scenario:
1. Allocate a lot of MR to fill the cache above the limit.
2. Wait a small amount of time "to calm" the system.
3. Start CPU extensive operations on multi-node cluster.
4. Expect performance degradation during MR cache shrink operation.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
1 parent 0ef2f05
History
Tip revision: ab5cdc31630c7596d81ca8fbe7d695f10666f39b authored by Leon Romanovsky on 21 October 2015, 06:21:17 UTC
IB/mlx5: Postpone remove_keys under knowledge of coming preemption
Tip revision: ab5cdc3
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.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitignore -rw-r--r-- 1.2 KB
.mailmap -rw-r--r-- 5.4 KB
COPYING -rw-r--r-- 18.3 KB
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MAINTAINERS -rw-r--r-- 328.5 KB
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