eventpoll: support busy poll per epoll instance

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Allow busy polling on a per-epoll context basis. The per-epoll context
usec timeout value is preferred, but the pre-existing system wide sysctl
value is still supported if it specified.

busy_poll_usecs is a u32, but in a follow up patch the ioctl provided to
the user only allows setting a value from 0 to S32_MAX.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Joe Damato 2024-02-13 06:16:42 +00:00 • committed by David S. Miller

parent 723615a14b

commit 85455c795c

1 changed files with 39 additions and 5 deletions

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fs/eventpoll.c

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