Hi, Re-post of an old series addressing thundering herd issues when sharing an event source fd amongst multiple epoll fds. Last posting was here for reference: https://lkml.org/lkml/2015/2/25/56 The patch herein drops the core scheduler 'rotate' changes I had previously proposed as this patch seems performant without those. I was prompted to re-post this because Madars Vitolins reported some good speedups with this patch using Enduro/X application. His writeup is here: https://mvitolin.wordpress.com/2015/12/05/endurox-testing-epollexclusive-flag/ Thanks, -Jason Sample epoll_clt text: EPOLLEXCLUSIVE Sets an exclusive wakeup mode for the epfd file descriptor that is being attached to the target file descriptor, fd. Thus, when an event occurs and multiple epfd file descriptors are attached to the same target file using EPOLLEXCLUSIVE, one or more epfds will receive an event with epoll_wait(2). The default in this scenario (when EPOLLEXCLUSIVE is not set) is for all epfds to receive an event. EPOLLEXLUSVIE may only be specified with the op EPOLL_CTL_ADD. Jason Baron (1): epoll: add EPOLLEXCLUSIVE flag fs/eventpoll.c | 24 +++++++++++++++++++++--- include/uapi/linux/eventpoll.h | 3 +++ 2 files changed, 24 insertions(+), 3 deletions(-) -- 2.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
