tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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task_work: add a scheduling point in task_work_run()

It seems commit 4a9d4b024a31 ("switch fput to task_work_add") re-
introduced the problem addressed in 944be0b22472 ("close_files(): add
scheduling point")

If a server process with a lot of files (say 2 million tcp sockets) is
killed, we can spend a lot of time in task_work_run() and trigger a soft
lockup.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Eric Dumazet and committed by
Linus Torvalds f341861f ec5da7f8

+1
+1
kernel/task_work.c
··· 75 75 p = q->next; 76 76 q->func(q); 77 77 q = p; 78 + cond_resched(); 78 79 } 79 80 } 80 81 }