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This patch does greatly reduce the probability of kernel hang caused by memory reclamation executed through flashcache's code. The probability is reduced because io required by memory reclamation can use thread spawned on different cores. The correct patch would be to create dedicated workqueue with WQ_MEM_RECLAIM but this patch is relatively unintruisive and does provably fix the issue in prodiction environments. Signed-off-by: Bartłomiej Święcki <bartlomiej.swiecki@corp.ovh.com>
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This patch does greatly reduce the probability of
kernel hang caused by memory reclamation executed
through flashcache's code.
The probability is reduced because io required by memory
reclamation can use thread spawned on different cores.
The correct patch would be to create dedicated workqueue
with WQ_MEM_RECLAIM but this patch is relatively unintruisive
and does provably fix the issue in prodiction environments.
Signed-off-by: Bartłomiej Święcki bartlomiej.swiecki@corp.ovh.com