2014-03-03 14:30:05 +04:00
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/*
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* Event loop thread
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*
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* Copyright Red Hat Inc., 2013
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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2016-01-29 20:50:05 +03:00
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#include "qemu/osdep.h"
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2014-03-03 14:30:05 +04:00
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#include "qom/object.h"
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#include "qom/object_interfaces.h"
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#include "qemu/module.h"
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#include "block/aio.h"
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2016-10-27 13:49:00 +03:00
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#include "block/block.h"
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2014-03-03 14:30:05 +04:00
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#include "sysemu/iothread.h"
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2018-02-01 14:18:31 +03:00
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#include "qapi/error.h"
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2018-02-27 02:13:27 +03:00
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#include "qapi/qapi-commands-misc.h"
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2014-09-18 15:30:49 +04:00
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#include "qemu/error-report.h"
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2015-07-09 09:55:38 +03:00
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#include "qemu/rcu.h"
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2016-10-27 13:48:59 +03:00
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#include "qemu/main-loop.h"
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2014-03-03 14:30:05 +04:00
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typedef ObjectClass IOThreadClass;
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#define IOTHREAD_GET_CLASS(obj) \
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OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
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#define IOTHREAD_CLASS(klass) \
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OBJECT_CLASS_CHECK(IOThreadClass, klass, TYPE_IOTHREAD)
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2018-03-22 11:56:30 +03:00
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#ifdef CONFIG_POSIX
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2017-01-26 20:01:19 +03:00
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/* Benchmark results from 2016 on NVMe SSD drives show max polling times around
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* 16-32 microseconds yield IOPS improvements for both iodepth=1 and iodepth=32
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* workloads.
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*/
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#define IOTHREAD_POLL_MAX_NS_DEFAULT 32768ULL
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2018-03-22 11:56:30 +03:00
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#else
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#define IOTHREAD_POLL_MAX_NS_DEFAULT 0ULL
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#endif
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2017-01-26 20:01:19 +03:00
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2016-10-27 13:48:59 +03:00
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static __thread IOThread *my_iothread;
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AioContext *qemu_get_current_aio_context(void)
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{
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return my_iothread ? my_iothread->ctx : qemu_get_aio_context();
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}
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2014-03-03 14:30:05 +04:00
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static void *iothread_run(void *opaque)
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{
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IOThread *iothread = opaque;
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2015-07-09 09:55:38 +03:00
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rcu_register_thread();
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2016-10-27 13:48:59 +03:00
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my_iothread = iothread;
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2014-02-27 14:48:41 +04:00
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qemu_mutex_lock(&iothread->init_done_lock);
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iothread->thread_id = qemu_get_thread_id();
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qemu_cond_signal(&iothread->init_done_cond);
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qemu_mutex_unlock(&iothread->init_done_lock);
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iothread: fix iothread_stop() race condition
There is a small chance that iothread_stop() hangs as follows:
Thread 3 (Thread 0x7f63eba5f700 (LWP 16105)):
#0 0x00007f64012c09b6 in ppoll () at /lib64/libc.so.6
#1 0x000055959992eac9 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2 0x000055959992eac9 in qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at util/qemu-timer.c:322
#3 0x0000559599930711 in aio_poll (ctx=0x55959bdb83c0, blocking=blocking@entry=true) at util/aio-posix.c:629
#4 0x00005595996806fe in iothread_run (opaque=0x55959bd78400) at iothread.c:59
#5 0x00007f640159f609 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f64012cce6f in clone () at /lib64/libc.so.6
Thread 1 (Thread 0x7f640b45b280 (LWP 16103)):
#0 0x00007f64015a0b6d in pthread_join () at /lib64/libpthread.so.0
#1 0x00005595999332ef in qemu_thread_join (thread=<optimized out>) at util/qemu-thread-posix.c:547
#2 0x00005595996808ae in iothread_stop (iothread=<optimized out>) at iothread.c:91
#3 0x000055959968094d in iothread_stop_iter (object=<optimized out>, opaque=<optimized out>) at iothread.c:102
#4 0x0000559599857d97 in do_object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0, recurse=recurse@entry=false) at qom/object.c:852
#5 0x0000559599859477 in object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0) at qom/object.c:867
#6 0x0000559599680a6e in iothread_stop_all () at iothread.c:341
#7 0x000055959955b1d5 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4913
The relevant code from iothread_run() is:
while (!atomic_read(&iothread->stopping)) {
aio_poll(iothread->ctx, true);
and iothread_stop():
iothread->stopping = true;
aio_notify(iothread->ctx);
...
qemu_thread_join(&iothread->thread);
The following scenario can occur:
1. IOThread:
while (!atomic_read(&iothread->stopping)) -> stopping=false
2. Main loop:
iothread->stopping = true;
aio_notify(iothread->ctx);
3. IOThread:
aio_poll(iothread->ctx, true); -> hang
The bug is explained by the AioContext->notify_me doc comments:
"If this field is 0, everything (file descriptors, bottom halves,
timers) will be re-evaluated before the next blocking poll(), thus the
event_notifier_set call can be skipped."
The problem is that "everything" does not include checking
iothread->stopping. This means iothread_run() will block in aio_poll()
if aio_notify() was called just before aio_poll().
This patch fixes the hang by replacing aio_notify() with
aio_bh_schedule_oneshot(). This makes aio_poll() or g_main_loop_run()
to return.
Implementing this properly required a new bool running flag. The new
flag prevents races that are tricky if we try to use iothread->stopping.
Now iothread->stopping is purely for iothread_stop() and
iothread->running is purely for the iothread_run() thread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171207201320.19284-6-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-12-07 23:13:19 +03:00
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while (iothread->running) {
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2016-10-27 13:49:06 +03:00
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aio_poll(iothread->ctx, true);
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2017-08-29 10:22:37 +03:00
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if (atomic_read(&iothread->worker_context)) {
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GMainLoop *loop;
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g_main_context_push_thread_default(iothread->worker_context);
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iothread->main_loop =
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g_main_loop_new(iothread->worker_context, TRUE);
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loop = iothread->main_loop;
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g_main_loop_run(iothread->main_loop);
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iothread->main_loop = NULL;
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g_main_loop_unref(loop);
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g_main_context_pop_thread_default(iothread->worker_context);
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}
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2014-03-03 14:30:05 +04:00
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}
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2015-07-09 09:55:38 +03:00
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rcu_unregister_thread();
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2014-03-03 14:30:05 +04:00
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return NULL;
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}
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iothread: fix iothread_stop() race condition
There is a small chance that iothread_stop() hangs as follows:
Thread 3 (Thread 0x7f63eba5f700 (LWP 16105)):
#0 0x00007f64012c09b6 in ppoll () at /lib64/libc.so.6
#1 0x000055959992eac9 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2 0x000055959992eac9 in qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at util/qemu-timer.c:322
#3 0x0000559599930711 in aio_poll (ctx=0x55959bdb83c0, blocking=blocking@entry=true) at util/aio-posix.c:629
#4 0x00005595996806fe in iothread_run (opaque=0x55959bd78400) at iothread.c:59
#5 0x00007f640159f609 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f64012cce6f in clone () at /lib64/libc.so.6
Thread 1 (Thread 0x7f640b45b280 (LWP 16103)):
#0 0x00007f64015a0b6d in pthread_join () at /lib64/libpthread.so.0
#1 0x00005595999332ef in qemu_thread_join (thread=<optimized out>) at util/qemu-thread-posix.c:547
#2 0x00005595996808ae in iothread_stop (iothread=<optimized out>) at iothread.c:91
#3 0x000055959968094d in iothread_stop_iter (object=<optimized out>, opaque=<optimized out>) at iothread.c:102
#4 0x0000559599857d97 in do_object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0, recurse=recurse@entry=false) at qom/object.c:852
#5 0x0000559599859477 in object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0) at qom/object.c:867
#6 0x0000559599680a6e in iothread_stop_all () at iothread.c:341
#7 0x000055959955b1d5 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4913
The relevant code from iothread_run() is:
while (!atomic_read(&iothread->stopping)) {
aio_poll(iothread->ctx, true);
and iothread_stop():
iothread->stopping = true;
aio_notify(iothread->ctx);
...
qemu_thread_join(&iothread->thread);
The following scenario can occur:
1. IOThread:
while (!atomic_read(&iothread->stopping)) -> stopping=false
2. Main loop:
iothread->stopping = true;
aio_notify(iothread->ctx);
3. IOThread:
aio_poll(iothread->ctx, true); -> hang
The bug is explained by the AioContext->notify_me doc comments:
"If this field is 0, everything (file descriptors, bottom halves,
timers) will be re-evaluated before the next blocking poll(), thus the
event_notifier_set call can be skipped."
The problem is that "everything" does not include checking
iothread->stopping. This means iothread_run() will block in aio_poll()
if aio_notify() was called just before aio_poll().
This patch fixes the hang by replacing aio_notify() with
aio_bh_schedule_oneshot(). This makes aio_poll() or g_main_loop_run()
to return.
Implementing this properly required a new bool running flag. The new
flag prevents races that are tricky if we try to use iothread->stopping.
Now iothread->stopping is purely for iothread_stop() and
iothread->running is purely for the iothread_run() thread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171207201320.19284-6-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-12-07 23:13:19 +03:00
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/* Runs in iothread_run() thread */
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static void iothread_stop_bh(void *opaque)
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{
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IOThread *iothread = opaque;
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iothread->running = false; /* stop iothread_run() */
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if (iothread->main_loop) {
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g_main_loop_quit(iothread->main_loop);
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}
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}
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2017-09-28 05:59:56 +03:00
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void iothread_stop(IOThread *iothread)
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2014-03-03 14:30:05 +04:00
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{
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2017-09-28 05:59:56 +03:00
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if (!iothread->ctx || iothread->stopping) {
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return;
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2014-09-18 15:30:49 +04:00
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}
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2014-03-03 14:30:05 +04:00
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iothread->stopping = true;
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iothread: fix iothread_stop() race condition
There is a small chance that iothread_stop() hangs as follows:
Thread 3 (Thread 0x7f63eba5f700 (LWP 16105)):
#0 0x00007f64012c09b6 in ppoll () at /lib64/libc.so.6
#1 0x000055959992eac9 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2 0x000055959992eac9 in qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at util/qemu-timer.c:322
#3 0x0000559599930711 in aio_poll (ctx=0x55959bdb83c0, blocking=blocking@entry=true) at util/aio-posix.c:629
#4 0x00005595996806fe in iothread_run (opaque=0x55959bd78400) at iothread.c:59
#5 0x00007f640159f609 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f64012cce6f in clone () at /lib64/libc.so.6
Thread 1 (Thread 0x7f640b45b280 (LWP 16103)):
#0 0x00007f64015a0b6d in pthread_join () at /lib64/libpthread.so.0
#1 0x00005595999332ef in qemu_thread_join (thread=<optimized out>) at util/qemu-thread-posix.c:547
#2 0x00005595996808ae in iothread_stop (iothread=<optimized out>) at iothread.c:91
#3 0x000055959968094d in iothread_stop_iter (object=<optimized out>, opaque=<optimized out>) at iothread.c:102
#4 0x0000559599857d97 in do_object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0, recurse=recurse@entry=false) at qom/object.c:852
#5 0x0000559599859477 in object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0) at qom/object.c:867
#6 0x0000559599680a6e in iothread_stop_all () at iothread.c:341
#7 0x000055959955b1d5 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4913
The relevant code from iothread_run() is:
while (!atomic_read(&iothread->stopping)) {
aio_poll(iothread->ctx, true);
and iothread_stop():
iothread->stopping = true;
aio_notify(iothread->ctx);
...
qemu_thread_join(&iothread->thread);
The following scenario can occur:
1. IOThread:
while (!atomic_read(&iothread->stopping)) -> stopping=false
2. Main loop:
iothread->stopping = true;
aio_notify(iothread->ctx);
3. IOThread:
aio_poll(iothread->ctx, true); -> hang
The bug is explained by the AioContext->notify_me doc comments:
"If this field is 0, everything (file descriptors, bottom halves,
timers) will be re-evaluated before the next blocking poll(), thus the
event_notifier_set call can be skipped."
The problem is that "everything" does not include checking
iothread->stopping. This means iothread_run() will block in aio_poll()
if aio_notify() was called just before aio_poll().
This patch fixes the hang by replacing aio_notify() with
aio_bh_schedule_oneshot(). This makes aio_poll() or g_main_loop_run()
to return.
Implementing this properly required a new bool running flag. The new
flag prevents races that are tricky if we try to use iothread->stopping.
Now iothread->stopping is purely for iothread_stop() and
iothread->running is purely for the iothread_run() thread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171207201320.19284-6-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-12-07 23:13:19 +03:00
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aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread);
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2014-03-03 14:30:05 +04:00
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qemu_thread_join(&iothread->thread);
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2017-09-28 05:59:56 +03:00
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}
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2017-01-26 20:01:19 +03:00
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static void iothread_instance_init(Object *obj)
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{
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IOThread *iothread = IOTHREAD(obj);
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iothread->poll_max_ns = IOTHREAD_POLL_MAX_NS_DEFAULT;
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}
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2016-09-08 12:28:51 +03:00
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static void iothread_instance_finalize(Object *obj)
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{
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IOThread *iothread = IOTHREAD(obj);
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2017-09-28 05:59:56 +03:00
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iothread_stop(iothread);
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2017-09-28 05:59:57 +03:00
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if (iothread->worker_context) {
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g_main_context_unref(iothread->worker_context);
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iothread->worker_context = NULL;
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}
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2014-02-27 14:48:41 +04:00
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qemu_cond_destroy(&iothread->init_done_cond);
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qemu_mutex_destroy(&iothread->init_done_lock);
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2016-09-26 08:29:58 +03:00
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if (!iothread->ctx) {
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return;
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}
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2014-03-03 14:30:05 +04:00
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aio_context_unref(iothread->ctx);
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}
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static void iothread_complete(UserCreatable *obj, Error **errp)
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{
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2014-09-18 15:30:49 +04:00
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Error *local_error = NULL;
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2014-03-03 14:30:05 +04:00
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IOThread *iothread = IOTHREAD(obj);
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2015-11-24 16:46:44 +03:00
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char *name, *thread_name;
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2014-03-03 14:30:05 +04:00
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iothread->stopping = false;
|
iothread: fix iothread_stop() race condition
There is a small chance that iothread_stop() hangs as follows:
Thread 3 (Thread 0x7f63eba5f700 (LWP 16105)):
#0 0x00007f64012c09b6 in ppoll () at /lib64/libc.so.6
#1 0x000055959992eac9 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2 0x000055959992eac9 in qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at util/qemu-timer.c:322
#3 0x0000559599930711 in aio_poll (ctx=0x55959bdb83c0, blocking=blocking@entry=true) at util/aio-posix.c:629
#4 0x00005595996806fe in iothread_run (opaque=0x55959bd78400) at iothread.c:59
#5 0x00007f640159f609 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f64012cce6f in clone () at /lib64/libc.so.6
Thread 1 (Thread 0x7f640b45b280 (LWP 16103)):
#0 0x00007f64015a0b6d in pthread_join () at /lib64/libpthread.so.0
#1 0x00005595999332ef in qemu_thread_join (thread=<optimized out>) at util/qemu-thread-posix.c:547
#2 0x00005595996808ae in iothread_stop (iothread=<optimized out>) at iothread.c:91
#3 0x000055959968094d in iothread_stop_iter (object=<optimized out>, opaque=<optimized out>) at iothread.c:102
#4 0x0000559599857d97 in do_object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0, recurse=recurse@entry=false) at qom/object.c:852
#5 0x0000559599859477 in object_child_foreach (obj=obj@entry=0x55959bdb8100, fn=fn@entry=0x559599680930 <iothread_stop_iter>, opaque=opaque@entry=0x0) at qom/object.c:867
#6 0x0000559599680a6e in iothread_stop_all () at iothread.c:341
#7 0x000055959955b1d5 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4913
The relevant code from iothread_run() is:
while (!atomic_read(&iothread->stopping)) {
aio_poll(iothread->ctx, true);
and iothread_stop():
iothread->stopping = true;
aio_notify(iothread->ctx);
...
qemu_thread_join(&iothread->thread);
The following scenario can occur:
1. IOThread:
while (!atomic_read(&iothread->stopping)) -> stopping=false
2. Main loop:
iothread->stopping = true;
aio_notify(iothread->ctx);
3. IOThread:
aio_poll(iothread->ctx, true); -> hang
The bug is explained by the AioContext->notify_me doc comments:
"If this field is 0, everything (file descriptors, bottom halves,
timers) will be re-evaluated before the next blocking poll(), thus the
event_notifier_set call can be skipped."
The problem is that "everything" does not include checking
iothread->stopping. This means iothread_run() will block in aio_poll()
if aio_notify() was called just before aio_poll().
This patch fixes the hang by replacing aio_notify() with
aio_bh_schedule_oneshot(). This makes aio_poll() or g_main_loop_run()
to return.
Implementing this properly required a new bool running flag. The new
flag prevents races that are tricky if we try to use iothread->stopping.
Now iothread->stopping is purely for iothread_stop() and
iothread->running is purely for the iothread_run() thread.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20171207201320.19284-6-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-12-07 23:13:19 +03:00
|
|
|
iothread->running = true;
|
2014-02-27 14:48:41 +04:00
|
|
|
iothread->thread_id = -1;
|
2014-09-18 15:30:49 +04:00
|
|
|
iothread->ctx = aio_context_new(&local_error);
|
|
|
|
if (!iothread->ctx) {
|
|
|
|
error_propagate(errp, local_error);
|
|
|
|
return;
|
|
|
|
}
|
2014-02-27 14:48:41 +04:00
|
|
|
|
2016-12-01 22:26:52 +03:00
|
|
|
aio_context_set_poll_params(iothread->ctx,
|
|
|
|
iothread->poll_max_ns,
|
|
|
|
iothread->poll_grow,
|
|
|
|
iothread->poll_shrink,
|
2016-12-01 22:26:45 +03:00
|
|
|
&local_error);
|
|
|
|
if (local_error) {
|
|
|
|
error_propagate(errp, local_error);
|
|
|
|
aio_context_unref(iothread->ctx);
|
|
|
|
iothread->ctx = NULL;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2014-02-27 14:48:41 +04:00
|
|
|
qemu_mutex_init(&iothread->init_done_lock);
|
|
|
|
qemu_cond_init(&iothread->init_done_cond);
|
2017-08-29 10:22:37 +03:00
|
|
|
iothread->once = (GOnce) G_ONCE_INIT;
|
2014-03-03 14:30:05 +04:00
|
|
|
|
|
|
|
/* This assumes we are called from a thread with useful CPU affinity for us
|
|
|
|
* to inherit.
|
|
|
|
*/
|
2015-11-24 16:46:44 +03:00
|
|
|
name = object_get_canonical_path_component(OBJECT(obj));
|
|
|
|
thread_name = g_strdup_printf("IO %s", name);
|
|
|
|
qemu_thread_create(&iothread->thread, thread_name, iothread_run,
|
2014-03-03 14:30:05 +04:00
|
|
|
iothread, QEMU_THREAD_JOINABLE);
|
2015-11-24 16:46:44 +03:00
|
|
|
g_free(thread_name);
|
|
|
|
g_free(name);
|
2014-02-27 14:48:41 +04:00
|
|
|
|
|
|
|
/* Wait for initialization to complete */
|
|
|
|
qemu_mutex_lock(&iothread->init_done_lock);
|
|
|
|
while (iothread->thread_id == -1) {
|
|
|
|
qemu_cond_wait(&iothread->init_done_cond,
|
|
|
|
&iothread->init_done_lock);
|
|
|
|
}
|
|
|
|
qemu_mutex_unlock(&iothread->init_done_lock);
|
2014-03-03 14:30:05 +04:00
|
|
|
}
|
|
|
|
|
2016-12-01 22:26:52 +03:00
|
|
|
typedef struct {
|
|
|
|
const char *name;
|
|
|
|
ptrdiff_t offset; /* field's byte offset in IOThread struct */
|
|
|
|
} PollParamInfo;
|
|
|
|
|
|
|
|
static PollParamInfo poll_max_ns_info = {
|
|
|
|
"poll-max-ns", offsetof(IOThread, poll_max_ns),
|
|
|
|
};
|
|
|
|
static PollParamInfo poll_grow_info = {
|
|
|
|
"poll-grow", offsetof(IOThread, poll_grow),
|
|
|
|
};
|
|
|
|
static PollParamInfo poll_shrink_info = {
|
|
|
|
"poll-shrink", offsetof(IOThread, poll_shrink),
|
|
|
|
};
|
|
|
|
|
|
|
|
static void iothread_get_poll_param(Object *obj, Visitor *v,
|
2016-12-01 22:26:45 +03:00
|
|
|
const char *name, void *opaque, Error **errp)
|
|
|
|
{
|
|
|
|
IOThread *iothread = IOTHREAD(obj);
|
2016-12-01 22:26:52 +03:00
|
|
|
PollParamInfo *info = opaque;
|
|
|
|
int64_t *field = (void *)iothread + info->offset;
|
2016-12-01 22:26:45 +03:00
|
|
|
|
2016-12-01 22:26:52 +03:00
|
|
|
visit_type_int64(v, name, field, errp);
|
2016-12-01 22:26:45 +03:00
|
|
|
}
|
|
|
|
|
2016-12-01 22:26:52 +03:00
|
|
|
static void iothread_set_poll_param(Object *obj, Visitor *v,
|
2016-12-01 22:26:45 +03:00
|
|
|
const char *name, void *opaque, Error **errp)
|
|
|
|
{
|
|
|
|
IOThread *iothread = IOTHREAD(obj);
|
2016-12-01 22:26:52 +03:00
|
|
|
PollParamInfo *info = opaque;
|
|
|
|
int64_t *field = (void *)iothread + info->offset;
|
2016-12-01 22:26:45 +03:00
|
|
|
Error *local_err = NULL;
|
|
|
|
int64_t value;
|
|
|
|
|
|
|
|
visit_type_int64(v, name, &value, &local_err);
|
|
|
|
if (local_err) {
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (value < 0) {
|
2016-12-01 22:26:52 +03:00
|
|
|
error_setg(&local_err, "%s value must be in range [0, %"PRId64"]",
|
|
|
|
info->name, INT64_MAX);
|
2016-12-01 22:26:45 +03:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2016-12-01 22:26:52 +03:00
|
|
|
*field = value;
|
2016-12-01 22:26:45 +03:00
|
|
|
|
|
|
|
if (iothread->ctx) {
|
2016-12-01 22:26:52 +03:00
|
|
|
aio_context_set_poll_params(iothread->ctx,
|
|
|
|
iothread->poll_max_ns,
|
|
|
|
iothread->poll_grow,
|
|
|
|
iothread->poll_shrink,
|
|
|
|
&local_err);
|
2016-12-01 22:26:45 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
error_propagate(errp, local_err);
|
|
|
|
}
|
|
|
|
|
2014-03-03 14:30:05 +04:00
|
|
|
static void iothread_class_init(ObjectClass *klass, void *class_data)
|
|
|
|
{
|
|
|
|
UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
|
|
|
|
ucc->complete = iothread_complete;
|
2016-12-01 22:26:45 +03:00
|
|
|
|
|
|
|
object_class_property_add(klass, "poll-max-ns", "int",
|
2016-12-01 22:26:52 +03:00
|
|
|
iothread_get_poll_param,
|
|
|
|
iothread_set_poll_param,
|
|
|
|
NULL, &poll_max_ns_info, &error_abort);
|
|
|
|
object_class_property_add(klass, "poll-grow", "int",
|
|
|
|
iothread_get_poll_param,
|
|
|
|
iothread_set_poll_param,
|
|
|
|
NULL, &poll_grow_info, &error_abort);
|
|
|
|
object_class_property_add(klass, "poll-shrink", "int",
|
|
|
|
iothread_get_poll_param,
|
|
|
|
iothread_set_poll_param,
|
|
|
|
NULL, &poll_shrink_info, &error_abort);
|
2014-03-03 14:30:05 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static const TypeInfo iothread_info = {
|
|
|
|
.name = TYPE_IOTHREAD,
|
|
|
|
.parent = TYPE_OBJECT,
|
|
|
|
.class_init = iothread_class_init,
|
|
|
|
.instance_size = sizeof(IOThread),
|
2017-01-26 20:01:19 +03:00
|
|
|
.instance_init = iothread_instance_init,
|
2014-03-03 14:30:05 +04:00
|
|
|
.instance_finalize = iothread_instance_finalize,
|
|
|
|
.interfaces = (InterfaceInfo[]) {
|
|
|
|
{TYPE_USER_CREATABLE},
|
|
|
|
{}
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static void iothread_register_types(void)
|
|
|
|
{
|
|
|
|
type_register_static(&iothread_info);
|
|
|
|
}
|
|
|
|
|
|
|
|
type_init(iothread_register_types)
|
|
|
|
|
|
|
|
char *iothread_get_id(IOThread *iothread)
|
|
|
|
{
|
|
|
|
return object_get_canonical_path_component(OBJECT(iothread));
|
|
|
|
}
|
|
|
|
|
|
|
|
AioContext *iothread_get_aio_context(IOThread *iothread)
|
|
|
|
{
|
|
|
|
return iothread->ctx;
|
|
|
|
}
|
2014-02-27 14:48:42 +04:00
|
|
|
|
|
|
|
static int query_one_iothread(Object *object, void *opaque)
|
|
|
|
{
|
|
|
|
IOThreadInfoList ***prev = opaque;
|
|
|
|
IOThreadInfoList *elem;
|
|
|
|
IOThreadInfo *info;
|
|
|
|
IOThread *iothread;
|
|
|
|
|
|
|
|
iothread = (IOThread *)object_dynamic_cast(object, TYPE_IOTHREAD);
|
|
|
|
if (!iothread) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
info = g_new0(IOThreadInfo, 1);
|
|
|
|
info->id = iothread_get_id(iothread);
|
|
|
|
info->thread_id = iothread->thread_id;
|
2017-02-10 12:41:17 +03:00
|
|
|
info->poll_max_ns = iothread->poll_max_ns;
|
|
|
|
info->poll_grow = iothread->poll_grow;
|
|
|
|
info->poll_shrink = iothread->poll_shrink;
|
2014-02-27 14:48:42 +04:00
|
|
|
|
|
|
|
elem = g_new0(IOThreadInfoList, 1);
|
|
|
|
elem->value = info;
|
|
|
|
elem->next = NULL;
|
|
|
|
|
|
|
|
**prev = elem;
|
|
|
|
*prev = &elem->next;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
IOThreadInfoList *qmp_query_iothreads(Error **errp)
|
|
|
|
{
|
|
|
|
IOThreadInfoList *head = NULL;
|
|
|
|
IOThreadInfoList **prev = &head;
|
2015-05-13 19:14:05 +03:00
|
|
|
Object *container = object_get_objects_root();
|
2014-02-27 14:48:42 +04:00
|
|
|
|
|
|
|
object_child_foreach(container, query_one_iothread, &prev);
|
|
|
|
return head;
|
|
|
|
}
|
2016-09-08 12:28:51 +03:00
|
|
|
|
2017-08-29 10:22:37 +03:00
|
|
|
static gpointer iothread_g_main_context_init(gpointer opaque)
|
|
|
|
{
|
|
|
|
AioContext *ctx;
|
|
|
|
IOThread *iothread = opaque;
|
|
|
|
GSource *source;
|
|
|
|
|
|
|
|
iothread->worker_context = g_main_context_new();
|
|
|
|
|
|
|
|
ctx = iothread_get_aio_context(iothread);
|
|
|
|
source = aio_get_g_source(ctx);
|
|
|
|
g_source_attach(source, iothread->worker_context);
|
|
|
|
g_source_unref(source);
|
|
|
|
|
|
|
|
aio_notify(iothread->ctx);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
GMainContext *iothread_get_g_main_context(IOThread *iothread)
|
|
|
|
{
|
|
|
|
g_once(&iothread->once, iothread_g_main_context_init, iothread);
|
|
|
|
|
|
|
|
return iothread->worker_context;
|
|
|
|
}
|
2017-09-28 05:59:55 +03:00
|
|
|
|
|
|
|
IOThread *iothread_create(const char *id, Error **errp)
|
|
|
|
{
|
|
|
|
Object *obj;
|
|
|
|
|
|
|
|
obj = object_new_with_props(TYPE_IOTHREAD,
|
|
|
|
object_get_internal_root(),
|
|
|
|
id, errp, NULL);
|
|
|
|
|
|
|
|
return IOTHREAD(obj);
|
|
|
|
}
|
|
|
|
|
|
|
|
void iothread_destroy(IOThread *iothread)
|
|
|
|
{
|
|
|
|
object_unparent(OBJECT(iothread));
|
|
|
|
}
|
2017-12-06 17:45:48 +03:00
|
|
|
|
|
|
|
/* Lookup IOThread by its id. Only finds user-created objects, not internal
|
|
|
|
* iothread_create() objects. */
|
|
|
|
IOThread *iothread_by_id(const char *id)
|
|
|
|
{
|
|
|
|
return IOTHREAD(object_resolve_path_type(id, TYPE_IOTHREAD, NULL));
|
|
|
|
}
|