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| author |   Leon Romanovsky <leonro@mellanox.com> | 2015-10-21 09:21:17 +0300 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2015-12-08 16:55:31 -0500 |
| commit | ab5cdc31630c7596d81ca8fbe7d695f10666f39b (patch) | |
| tree | c544b85a8b79e6bf9d1f57dc8eaf63df58b3154c /include | |
| parent | IB/mlx4: Use vmalloc for WR buffers when needed (diff) | |
| download | linux-dev-ab5cdc31630c7596d81ca8fbe7d695f10666f39b.tar.xz linux-dev-ab5cdc31630c7596d81ca8fbe7d695f10666f39b.zip | |
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>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions