0c330a734b
aio_co_wake provides the infrastructure to start a coroutine on a "home" AioContext. It will be used by CoMutex and CoQueue, so that coroutines don't jump from one context to another when they go to sleep on a mutex or waitqueue. However, it can also be used as a more efficient alternative to one-shot bottom halves, and saves the effort of tracking which AioContext a coroutine is running on. aio_co_schedule is the part of aio_co_wake that starts a coroutine on a remove AioContext, but it is also useful to implement e.g. bdrv_set_aio_context callbacks. The implementation of aio_co_schedule is based on a lock-free multiple-producer, single-consumer queue. The multiple producers use cmpxchg to add to a LIFO stack. The consumer (a per-AioContext bottom half) grabs all items added so far, inverts the list to make it FIFO, and goes through it one item at a time until it's empty. The data structure was inspired by OSv, which uses it in the very code we'll "port" to QEMU for the thread-safe CoMutex. Most of the new code is really tests. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-3-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> |
||
|---|---|---|
| .. | ||
| acl.h | ||
| atomic.h | ||
| base64.h | ||
| bcd.h | ||
| bitmap.h | ||
| bitops.h | ||
| bswap.h | ||
| buffer.h | ||
| compatfd.h | ||
| compiler.h | ||
| config-file.h | ||
| coroutine_int.h | ||
| coroutine.h | ||
| crc32c.h | ||
| cutils.h | ||
| envlist.h | ||
| error-report.h | ||
| event_notifier.h | ||
| fifo8.h | ||
| fifo32.h | ||
| fprintf-fn.h | ||
| futex.h | ||
| hbitmap.h | ||
| help_option.h | ||
| host-utils.h | ||
| id.h | ||
| int128.h | ||
| iov.h | ||
| jhash.h | ||
| log.h | ||
| main-loop.h | ||
| memfd.h | ||
| mmap-alloc.h | ||
| module.h | ||
| notify.h | ||
| option_int.h | ||
| option.h | ||
| osdep.h | ||
| path.h | ||
| processor.h | ||
| qdist.h | ||
| qht.h | ||
| queue.h | ||
| range.h | ||
| ratelimit.h | ||
| rcu_queue.h | ||
| rcu.h | ||
| readline.h | ||
| seqlock.h | ||
| sockets.h | ||
| thread-posix.h | ||
| thread-win32.h | ||
| thread.h | ||
| throttle.h | ||
| timed-average.h | ||
| timer.h | ||
| typedefs.h | ||
| unicode.h | ||
| uri.h | ||
| uuid.h | ||
| xattr.h | ||