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ab5cdc3163
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 <[email protected]> Signed-off-by: Eli Cohen <[email protected]> Signed-off-by: Doug Ledford <[email protected]> |
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