From 4a1cba3802554a3b077d436002519ff1fb0c18bf Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Thu, 1 Dec 2016 19:26:42 +0000 Subject: aio: add polling mode to AioContext The AioContext event loop uses ppoll(2) or epoll_wait(2) to monitor file descriptors or until a timer expires. In cases like virtqueues, Linux AIO, and ThreadPool it is technically possible to wait for events via polling (i.e. continuously checking for events without blocking). Polling can be faster than blocking syscalls because file descriptors, the process scheduler, and system calls are bypassed. The main disadvantage to polling is that it increases CPU utilization. In classic polling configuration a full host CPU thread might run at 100% to respond to events as quickly as possible. This patch implements a timeout so we fall back to blocking syscalls if polling detects no activity. After the timeout no CPU cycles are wasted on polling until the next event loop iteration. The run_poll_handlers_begin() and run_poll_handlers_end() trace events are added to aid performance analysis and troubleshooting. If you need to know whether polling mode is being used, trace these events to find out. Note that the AioContext is now re-acquired before disabling notify_me in the non-polling case. This makes the code cleaner since notify_me was enabled outside the non-polling AioContext release region. This change is correct since it's safe to keep notify_me enabled longer (disabling is an optimization) but potentially causes unnecessary event_notifer_set() calls. I think the chance of performance regression is small here. Signed-off-by: Stefan Hajnoczi Reviewed-by: Paolo Bonzini Message-id: 20161201192652.9509-4-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi --- include/block/aio.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'include/block/aio.h') diff --git a/include/block/aio.h b/include/block/aio.h index 7d9cd0d03f..349143f6d9 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -131,6 +131,12 @@ struct AioContext { int external_disable_cnt; + /* Number of AioHandlers without .io_poll() */ + int poll_disable_cnt; + + /* Maximum polling time in nanoseconds */ + int64_t poll_max_ns; + /* epoll(7) state used when built with CONFIG_EPOLL */ int epollfd; bool epoll_enabled; @@ -481,4 +487,14 @@ static inline bool aio_context_in_iothread(AioContext *ctx) */ void aio_context_setup(AioContext *ctx); +/** + * aio_context_set_poll_params: + * @ctx: the aio context + * @max_ns: how long to busy poll for, in nanoseconds + * + * Poll mode can be disabled by setting poll_max_ns to 0. + */ +void aio_context_set_poll_params(AioContext *ctx, int64_t max_ns, + Error **errp); + #endif -- cgit v1.2.3