When processes sleep in TASK_INTERRUPTIBLE state during select(2) or poll(2) system calls, add the TASK_FREEZABLE flag. This prevents them from being prematurely awakened during system suspend/resume operations, avoiding unnecessary wakeup overhead. The functions do_select() and do_poll() are exclusively used within their respective system call paths. During sleep in these paths, no kernel locks are held. Therefore, adding TASK_FREEZABLE is safe. Signed-off-by: Dai Junbing <daijunbing@xxxxxxxx> --- fs/select.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/select.c b/fs/select.c index 9fb650d03d52..8a1e9fe12650 100644 --- a/fs/select.c +++ b/fs/select.c @@ -600,7 +600,7 @@ static noinline_for_stack int do_select(int n, fd_set_bits *fds, struct timespec to = &expire; } - if (!poll_schedule_timeout(&table, TASK_INTERRUPTIBLE, + if (!poll_schedule_timeout(&table, TASK_INTERRUPTIBLE | TASK_FREEZABLE, to, slack)) timed_out = 1; } @@ -955,7 +955,7 @@ static int do_poll(struct poll_list *list, struct poll_wqueues *wait, to = &expire; } - if (!poll_schedule_timeout(wait, TASK_INTERRUPTIBLE, to, slack)) + if (!poll_schedule_timeout(wait, TASK_INTERRUPTIBLE | TASK_FREEZABLE, to, slack)) timed_out = 1; } return count; -- 2.25.1
