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eventpoll: Trigger napi_busy_loop, if prefer_busy_poll is set

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Setting prefer_busy_poll now leads to an effectively nonblocking
iteration though napi_busy_loop, even when busy_poll_usecs is 0.

Signed-off-by: Martin Karsten <mkarsten@uwaterloo.ca>
Co-developed-by: Joe Damato <jdamato@fastly.com>
Signed-off-by: Joe Damato <jdamato@fastly.com>
Tested-by: Joe Damato <jdamato@fastly.com>
Tested-by: Martin Karsten <mkarsten@uwaterloo.ca>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Link: https://patch.msgid.link/20241109050245.191288-4-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Martin Karsten 2024-11-09 05:02:33 +00:00 committed by Jakub Kicinski
parent 3fcbecbdeb
commit ab5b28b007
1 changed files with 3 additions and 1 deletions
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4
fs/eventpoll.c
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@ -420,7 +420,9 @@ static bool busy_loop_ep_timeout(unsigned long start_time,
static bool ep_busy_loop_on(struct eventpoll *ep)
{
return !!READ_ONCE(ep->busy_poll_usecs) || net_busy_loop_on();
return !!READ_ONCE(ep->busy_poll_usecs) ||
READ_ONCE(ep->prefer_busy_poll) ||
net_busy_loop_on();
}
static bool ep_busy_loop_end(void *p, unsigned long start_time)