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authorStefan Hajnoczi <stefanha@redhat.com>2020-03-05 17:08:02 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2020-03-09 16:41:31 +0000
commit1f050a4690f62a1e7dabc4f44141e9f762c3769f (patch)
tree289c3970dfed15773b4a6cc234d2c580f28ef189 /.gitlab-ci.d
parent3aa221b382c9b36db1750ef5ed340b6566aacb8c (diff)
aio-posix: extract ppoll(2) and epoll(7) fd monitoring
The ppoll(2) and epoll(7) file descriptor monitoring implementations are mixed with the core util/aio-posix.c code. Before adding another implementation for Linux io_uring, extract out the existing ones so there is a clear interface and the core code is simpler. The new interface is AioContext->fdmon_ops, a pointer to a FDMonOps struct. See the patch for details. Semantic changes: 1. ppoll(2) now reflects events from pollfds[] back into AioHandlers while we're still on the clock for adaptive polling. This was already happening for epoll(7), so if it's really an issue then we'll need to fix both in the future. 2. epoll(7)'s fallback to ppoll(2) while external events are disabled was broken when the number of fds exceeded the epoll(7) upgrade threshold. I guess this code path simply wasn't tested and no one noticed the bug. I didn't go out of my way to fix it but the correct code is simpler than preserving the bug. I also took some liberties in removing the unnecessary AioContext->epoll_available (just check AioContext->epollfd != -1 instead) and AioContext->epoll_enabled (it's implicit if our AioContext->fdmon_ops callbacks are being invoked) fields. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Link: https://lore.kernel.org/r/20200305170806.1313245-4-stefanha@redhat.com Message-Id: <20200305170806.1313245-4-stefanha@redhat.com>
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