[Qemu-devel] [PULL 0/4] Block patches

[Qemu-devel] [PULL 0/4] Block patches

[Stefan Hajnoczi]

The following changes since commit f58d9620aa4a514b1227074ff56eefd1334a6225:

  Merge remote-tracking branch 'remotes/rth/tags/pull-dt-20180326' into staging (2018-03-27 10:27:34 +0100)

are available in the Git repository at:

  git://github.com/stefanha/qemu.git tags/block-pull-request

for you to fetch changes up to f5a53faad4bfbf1b86012a13055d2a1a774a42b6:

  MAINTAINERS: add include/block/aio-wait.h (2018-03-27 13:05:48 +0100)

----------------------------------------------------------------

----------------------------------------------------------------

Stefan Hajnoczi (4):
  queue: add QSIMPLEQ_PREPEND()
  coroutine: avoid co_queue_wakeup recursion
  coroutine: add test-aio coroutine queue chaining test case
  MAINTAINERS: add include/block/aio-wait.h

 MAINTAINERS                  |   1 +
 include/qemu/coroutine_int.h |   1 -
 include/qemu/queue.h         |   8 ++++
 block/io.c                   |   3 +-
 tests/test-aio.c             |  65 ++++++++++++++++++++-----
 util/qemu-coroutine-lock.c   |  34 -------------
 util/qemu-coroutine.c        | 110 +++++++++++++++++++++++--------------------
 7 files changed, 121 insertions(+), 101 deletions(-)

-- 
2.14.3

[Qemu-devel] [PULL 1/4] queue: add QSIMPLEQ_PREPEND()

[Stefan Hajnoczi]

QSIMPLEQ_CONCAT(a, b) joins a = a + b.  The new QSIMPLEQ_PREPEND(a, b)
API joins a = b + a.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180322152834.12656-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 include/qemu/queue.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/qemu/queue.h b/include/qemu/queue.h
index aa270d2b38..59fd1203a1 100644
--- a/include/qemu/queue.h
+++ b/include/qemu/queue.h
@@ -324,6 +324,14 @@ struct {                                                                \
     }                                                                   \
 } while (/*CONSTCOND*/0)
 
+#define QSIMPLEQ_PREPEND(head1, head2) do {                             \
+    if (!QSIMPLEQ_EMPTY((head2))) {                                     \
+        *(head2)->sqh_last = (head1)->sqh_first;                        \
+        (head1)->sqh_first = (head2)->sqh_first;                          \
+        QSIMPLEQ_INIT((head2));                                         \
+    }                                                                   \
+} while (/*CONSTCOND*/0)
+
 #define QSIMPLEQ_LAST(head, type, field)                                \
     (QSIMPLEQ_EMPTY((head)) ?                                           \
         NULL :                                                          \
-- 
2.14.3

[Qemu-devel] [PULL 2/4] coroutine: avoid co_queue_wakeup recursion

[Stefan Hajnoczi]

qemu_aio_coroutine_enter() is (indirectly) called recursively when
processing co_queue_wakeup.  This can lead to stack exhaustion.

This patch rewrites co_queue_wakeup in an iterative fashion (instead of
recursive) with bounded memory usage to prevent stack exhaustion.

qemu_co_queue_run_restart() is inlined into qemu_aio_coroutine_enter()
and the qemu_coroutine_enter() call is turned into a loop to avoid
recursion.

There is one change that is worth mentioning:  Previously, when
coroutine A queued coroutine B, qemu_co_queue_run_restart() entered
coroutine B from coroutine A.  If A was terminating then it would still
stay alive until B yielded.  After this patch B is entered by A's parent
so that a A can be deleted immediately if it is terminating.

It is safe to make this change since B could never interact with A if it
was terminating anyway.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180322152834.12656-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 include/qemu/coroutine_int.h |   1 -
 block/io.c                   |   3 +-
 util/qemu-coroutine-lock.c   |  34 -------------
 util/qemu-coroutine.c        | 110 +++++++++++++++++++++++--------------------
 4 files changed, 60 insertions(+), 88 deletions(-)

diff --git a/include/qemu/coroutine_int.h b/include/qemu/coroutine_int.h
index 59e8406398..bd6b0468e1 100644
--- a/include/qemu/coroutine_int.h
+++ b/include/qemu/coroutine_int.h
@@ -68,6 +68,5 @@ Coroutine *qemu_coroutine_new(void);
 void qemu_coroutine_delete(Coroutine *co);
 CoroutineAction qemu_coroutine_switch(Coroutine *from, Coroutine *to,
                                       CoroutineAction action);
-void coroutine_fn qemu_co_queue_run_restart(Coroutine *co);
 
 #endif
diff --git a/block/io.c b/block/io.c
index 2b09c656d0..bd9a19a9c4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -249,8 +249,7 @@ static void coroutine_fn bdrv_co_yield_to_drain(BlockDriverState *bs,
     BdrvCoDrainData data;
 
     /* Calling bdrv_drain() from a BH ensures the current coroutine yields and
-     * other coroutines run if they were queued from
-     * qemu_co_queue_run_restart(). */
+     * other coroutines run if they were queued by aio_co_enter(). */
 
     assert(qemu_in_coroutine());
     data = (BdrvCoDrainData) {
diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c
index 5a80c10690..27438a1858 100644
--- a/util/qemu-coroutine-lock.c
+++ b/util/qemu-coroutine-lock.c
@@ -68,40 +68,6 @@ void coroutine_fn qemu_co_queue_wait_impl(CoQueue *queue, QemuLockable *lock)
     }
 }
 
-/**
- * qemu_co_queue_run_restart:
- *
- * Enter each coroutine that was previously marked for restart by
- * qemu_co_queue_next() or qemu_co_queue_restart_all().  This function is
- * invoked by the core coroutine code when the current coroutine yields or
- * terminates.
- */
-void qemu_co_queue_run_restart(Coroutine *co)
-{
-    Coroutine *next;
-    QSIMPLEQ_HEAD(, Coroutine) tmp_queue_wakeup =
-        QSIMPLEQ_HEAD_INITIALIZER(tmp_queue_wakeup);
-
-    trace_qemu_co_queue_run_restart(co);
-
-    /* Because "co" has yielded, any coroutine that we wakeup can resume it.
-     * If this happens and "co" terminates, co->co_queue_wakeup becomes
-     * invalid memory.  Therefore, use a temporary queue and do not touch
-     * the "co" coroutine as soon as you enter another one.
-     *
-     * In its turn resumed "co" can populate "co_queue_wakeup" queue with
-     * new coroutines to be woken up.  The caller, who has resumed "co",
-     * will be responsible for traversing the same queue, which may cause
-     * a different wakeup order but not any missing wakeups.
-     */
-    QSIMPLEQ_CONCAT(&tmp_queue_wakeup, &co->co_queue_wakeup);
-
-    while ((next = QSIMPLEQ_FIRST(&tmp_queue_wakeup))) {
-        QSIMPLEQ_REMOVE_HEAD(&tmp_queue_wakeup, co_queue_next);
-        qemu_coroutine_enter(next);
-    }
-}
-
 static bool qemu_co_queue_do_restart(CoQueue *queue, bool single)
 {
     Coroutine *next;
diff --git a/util/qemu-coroutine.c b/util/qemu-coroutine.c
index 9eff7fd450..1ba4191b84 100644
--- a/util/qemu-coroutine.c
+++ b/util/qemu-coroutine.c
@@ -104,57 +104,65 @@ static void coroutine_delete(Coroutine *co)
 
 void qemu_aio_coroutine_enter(AioContext *ctx, Coroutine *co)
 {
-    Coroutine *self = qemu_coroutine_self();
-    CoroutineAction ret;
-
-    /* Cannot rely on the read barrier for co in aio_co_wake(), as there are
-     * callers outside of aio_co_wake() */
-    const char *scheduled = atomic_mb_read(&co->scheduled);
-
-    trace_qemu_aio_coroutine_enter(ctx, self, co, co->entry_arg);
-
-    /* if the Coroutine has already been scheduled, entering it again will
-     * cause us to enter it twice, potentially even after the coroutine has
-     * been deleted */
-    if (scheduled) {
-        fprintf(stderr,
-                "%s: Co-routine was already scheduled in '%s'\n",
-                __func__, scheduled);
-        abort();
-    }
-
-    if (co->caller) {
-        fprintf(stderr, "Co-routine re-entered recursively\n");
-        abort();
-    }
-
-    co->caller = self;
-    co->ctx = ctx;
-
-    /* Store co->ctx before anything that stores co.  Matches
-     * barrier in aio_co_wake and qemu_co_mutex_wake.
-     */
-    smp_wmb();
-
-    ret = qemu_coroutine_switch(self, co, COROUTINE_ENTER);
-
-    qemu_co_queue_run_restart(co);
-
-    /* Beware, if ret == COROUTINE_YIELD and qemu_co_queue_run_restart()
-     * has started any other coroutine, "co" might have been reentered
-     * and even freed by now!  So be careful and do not touch it.
-     */
-
-    switch (ret) {
-    case COROUTINE_YIELD:
-        return;
-    case COROUTINE_TERMINATE:
-        assert(!co->locks_held);
-        trace_qemu_coroutine_terminate(co);
-        coroutine_delete(co);
-        return;
-    default:
-        abort();
+    QSIMPLEQ_HEAD(, Coroutine) pending = QSIMPLEQ_HEAD_INITIALIZER(pending);
+    Coroutine *from = qemu_coroutine_self();
+
+    QSIMPLEQ_INSERT_TAIL(&pending, co, co_queue_next);
+
+    /* Run co and any queued coroutines */
+    while (!QSIMPLEQ_EMPTY(&pending)) {
+        Coroutine *to = QSIMPLEQ_FIRST(&pending);
+        CoroutineAction ret;
+
+        /* Cannot rely on the read barrier for to in aio_co_wake(), as there are
+         * callers outside of aio_co_wake() */
+        const char *scheduled = atomic_mb_read(&to->scheduled);
+
+        QSIMPLEQ_REMOVE_HEAD(&pending, co_queue_next);
+
+        trace_qemu_aio_coroutine_enter(ctx, from, to, to->entry_arg);
+
+        /* if the Coroutine has already been scheduled, entering it again will
+         * cause us to enter it twice, potentially even after the coroutine has
+         * been deleted */
+        if (scheduled) {
+            fprintf(stderr,
+                    "%s: Co-routine was already scheduled in '%s'\n",
+                    __func__, scheduled);
+            abort();
+        }
+
+        if (to->caller) {
+            fprintf(stderr, "Co-routine re-entered recursively\n");
+            abort();
+        }
+
+        to->caller = from;
+        to->ctx = ctx;
+
+        /* Store to->ctx before anything that stores to.  Matches
+         * barrier in aio_co_wake and qemu_co_mutex_wake.
+         */
+        smp_wmb();
+
+        ret = qemu_coroutine_switch(from, to, COROUTINE_ENTER);
+
+        /* Queued coroutines are run depth-first; previously pending coroutines
+         * run after those queued more recently.
+         */
+        QSIMPLEQ_PREPEND(&pending, &to->co_queue_wakeup);
+
+        switch (ret) {
+        case COROUTINE_YIELD:
+            break;
+        case COROUTINE_TERMINATE:
+            assert(!to->locks_held);
+            trace_qemu_coroutine_terminate(to);
+            coroutine_delete(to);
+            break;
+        default:
+            abort();
+        }
     }
 }
 
-- 
2.14.3

[Qemu-devel] [PULL 3/4] coroutine: add test-aio coroutine queue chaining test case

[Stefan Hajnoczi]

Check that two coroutines can queue each other repeatedly without
hitting stack exhaustion.

Switch to qemu_init_main_loop() in main() because coroutines use
qemu_get_aio_context() - they don't know about test-aio's ctx variable.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180322152834.12656-4-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 tests/test-aio.c | 65 ++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 52 insertions(+), 13 deletions(-)

diff --git a/tests/test-aio.c b/tests/test-aio.c
index 54e20d6ab1..86fb73b3d5 100644
--- a/tests/test-aio.c
+++ b/tests/test-aio.c
@@ -16,6 +16,8 @@
 #include "qemu/timer.h"
 #include "qemu/sockets.h"
 #include "qemu/error-report.h"
+#include "qemu/coroutine.h"
+#include "qemu/main-loop.h"
 
 static AioContext *ctx;
 
@@ -827,24 +829,59 @@ static void test_source_timer_schedule(void)
     timer_del(&data.timer);
 }
 
+/*
+ * Check that aio_co_enter() can chain many times
+ *
+ * Two coroutines should be able to invoke each other via aio_co_enter() many
+ * times without hitting a limit like stack exhaustion.  In other words, the
+ * calls should be chained instead of nested.
+ */
+
+typedef struct {
+    Coroutine *other;
+    unsigned i;
+    unsigned max;
+} ChainData;
+
+static void coroutine_fn chain(void *opaque)
+{
+    ChainData *data = opaque;
+
+    for (data->i = 0; data->i < data->max; data->i++) {
+        /* Queue up the other coroutine... */
+        aio_co_enter(ctx, data->other);
+
+        /* ...and give control to it */
+        qemu_coroutine_yield();
+    }
+}
+
+static void test_queue_chaining(void)
+{
+    /* This number of iterations hit stack exhaustion in the past: */
+    ChainData data_a = { .max = 25000 };
+    ChainData data_b = { .max = 25000 };
+
+    data_b.other = qemu_coroutine_create(chain, &data_a);
+    data_a.other = qemu_coroutine_create(chain, &data_b);
+
+    qemu_coroutine_enter(data_b.other);
+
+    g_assert_cmpint(data_a.i, ==, data_a.max);
+    g_assert_cmpint(data_b.i, ==, data_b.max - 1);
+
+    /* Allow the second coroutine to terminate */
+    qemu_coroutine_enter(data_a.other);
+
+    g_assert_cmpint(data_b.i, ==, data_b.max);
+}
 
 /* End of tests.  */
 
 int main(int argc, char **argv)
 {
-    Error *local_error = NULL;
-    GSource *src;
-
-    init_clocks(NULL);
-
-    ctx = aio_context_new(&local_error);
-    if (!ctx) {
-        error_reportf_err(local_error, "Failed to create AIO Context: ");
-        exit(1);
-    }
-    src = aio_get_g_source(ctx);
-    g_source_attach(src, NULL);
-    g_source_unref(src);
+    qemu_init_main_loop(&error_fatal);
+    ctx = qemu_get_aio_context();
 
     while (g_main_context_iteration(NULL, false));
 
@@ -864,6 +901,8 @@ int main(int argc, char **argv)
     g_test_add_func("/aio/external-client",         test_aio_external_client);
     g_test_add_func("/aio/timer/schedule",          test_timer_schedule);
 
+    g_test_add_func("/aio/coroutine/queue-chaining", test_queue_chaining);
+
     g_test_add_func("/aio-gsource/flush",                   test_source_flush);
     g_test_add_func("/aio-gsource/bh/schedule",             test_source_bh_schedule);
     g_test_add_func("/aio-gsource/bh/schedule10",           test_source_bh_schedule10);
-- 
2.14.3

[Qemu-devel] [PULL 4/4] MAINTAINERS: add include/block/aio-wait.h

[Stefan Hajnoczi]

The include/block/aio-wait.h header file was added by commit
7719f3c968c59e1bcda7e177679dc765b59e578f ("block: extract
AIO_WAIT_WHILE() from BlockDriverState") without updating MAINTAINERS.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20180312132204.23683-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 6fa36c7a2d..24b70169bc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1351,6 +1351,7 @@ F: util/aio-*.c
 F: block/io.c
 F: migration/block*
 F: include/block/aio.h
+F: include/block/aio-wait.h
 F: scripts/qemugdb/aio.py
 T: git git://github.com/stefanha/qemu.git block
 
-- 
2.14.3

Re: [Qemu-devel] [PULL 0/4] Block patches

[Peter Maydell]

On 27 March 2018 at 15:41, Stefan Hajnoczi <stefanha@redhat.com> wrote:
> The following changes since commit f58d9620aa4a514b1227074ff56eefd1334a6225:
>
>   Merge remote-tracking branch 'remotes/rth/tags/pull-dt-20180326' into staging (2018-03-27 10:27:34 +0100)
>
> are available in the Git repository at:
>
>   git://github.com/stefanha/qemu.git tags/block-pull-request
>
> for you to fetch changes up to f5a53faad4bfbf1b86012a13055d2a1a774a42b6:
>
>   MAINTAINERS: add include/block/aio-wait.h (2018-03-27 13:05:48 +0100)
>
> ----------------------------------------------------------------
>
> ----------------------------------------------------------------
>
> Stefan Hajnoczi (4):
>   queue: add QSIMPLEQ_PREPEND()
>   coroutine: avoid co_queue_wakeup recursion
>   coroutine: add test-aio coroutine queue chaining test case
>   MAINTAINERS: add include/block/aio-wait.h
>
>  MAINTAINERS                  |   1 +
>  include/qemu/coroutine_int.h |   1 -
>  include/qemu/queue.h         |   8 ++++
>  block/io.c                   |   3 +-
>  tests/test-aio.c             |  65 ++++++++++++++++++++-----
>  util/qemu-coroutine-lock.c   |  34 -------------
>  util/qemu-coroutine.c        | 110 +++++++++++++++++++++++--------------------
>  7 files changed, 121 insertions(+), 101 deletions(-)
>

Applied, thanks.

-- PMM

Re: [Qemu-devel] [PULL 0/4] Block patches

[no-reply]

Hi,

This series failed docker-build@min-glib build test. Please find the testing commands and
their output below. If you have Docker installed, you can probably reproduce it
locally.

Type: series
Message-id: 20180327144124.32533-1-stefanha@redhat.com
Subject: [Qemu-devel] [PULL 0/4] Block patches

=== TEST SCRIPT BEGIN ===
#!/bin/bash
set -e
git submodule update --init dtc
# Let docker tests dump environment info
export SHOW_ENV=1
export J=8
time make docker-test-build@min-glib
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
Switched to a new branch 'test'
58d76f2171 queue: add QSIMPLEQ_PREPEND()

=== OUTPUT BEGIN ===
Submodule 'dtc' (git://git.qemu-project.org/dtc.git) registered for path 'dtc'
Cloning into '/var/tmp/patchew-tester-tmp-6awfngpj/src/dtc'...
Submodule path 'dtc': checked out 'e54388015af1fb4bf04d0bca99caba1074d9cc42'
  BUILD   min-glib
make[1]: Entering directory '/var/tmp/patchew-tester-tmp-6awfngpj/src'
  GEN     /var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848/qemu.tar
Cloning into '/var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848/qemu.tar.vroot'...
done.
Checking out files:  33% (2006/6066)   
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Checking out files: 100% (6066/6066), done.
Your branch is up-to-date with 'origin/test'.
Submodule 'dtc' (git://git.qemu-project.org/dtc.git) registered for path 'dtc'
Cloning into '/var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848/qemu.tar.vroot/dtc'...
Submodule path 'dtc': checked out 'e54388015af1fb4bf04d0bca99caba1074d9cc42'
Submodule 'ui/keycodemapdb' (git://git.qemu.org/keycodemapdb.git) registered for path 'ui/keycodemapdb'
Cloning into '/var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848/qemu.tar.vroot/ui/keycodemapdb'...
Submodule path 'ui/keycodemapdb': checked out '6b3d716e2b6472eb7189d3220552280ef3d832ce'
tar: /var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848/qemu.tar: Wrote only 2048 of 10240 bytes
tar: Error is not recoverable: exiting now
failed to create tar file
  COPY    RUNNER
    RUN test-build in qemu:min-glib 
tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now
/var/tmp/qemu/run: line 32: prep_fail: command not found
Environment variables:
HOSTNAME=7ec65e6e427d
MAKEFLAGS= -j8
J=8
CCACHE_DIR=/var/tmp/ccache
EXTRA_CONFIGURE_OPTS=
V=
SHOW_ENV=1
PATH=/usr/lib/ccache:/usr/lib64/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
TARGET_LIST=
SHLVL=1
HOME=/root
TEST_DIR=/tmp/qemu-test
FEATURES= dtc
DEBUG=
_=/usr/bin/env

Configure options:
--enable-werror --target-list=x86_64-softmmu,aarch64-softmmu --prefix=/tmp/qemu-test/install

ERROR: DTC (libfdt) version >= 1.4.2 not present.
       Please install the DTC (libfdt) devel package

Traceback (most recent call last):
  File "./tests/docker/docker.py", line 407, in <module>
    sys.exit(main())
  File "./tests/docker/docker.py", line 404, in main
    return args.cmdobj.run(args, argv)
  File "./tests/docker/docker.py", line 261, in run
    return Docker().run(argv, args.keep, quiet=args.quiet)
  File "./tests/docker/docker.py", line 229, in run
    quiet=quiet)
  File "./tests/docker/docker.py", line 147, in _do_check
    return subprocess.check_call(self._command + cmd, **kwargs)
  File "/usr/lib64/python2.7/subprocess.py", line 186, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['docker', 'run', '--label', 'com.qemu.instance.uuid=c90672f634b211e88e0f52540069c830', '-u', '0', '--security-opt', 'seccomp=unconfined', '--rm', '--net=none', '-e', 'TARGET_LIST=', '-e', 'EXTRA_CONFIGURE_OPTS=', '-e', 'V=', '-e', 'J=8', '-e', 'DEBUG=', '-e', 'SHOW_ENV=1', '-e', 'CCACHE_DIR=/var/tmp/ccache', '-v', '/root/.cache/qemu-docker-ccache:/var/tmp/ccache:z', '-v', '/var/tmp/patchew-tester-tmp-6awfngpj/src/docker-src.2018-03-31-03.11.27.1848:/var/tmp/qemu:z,ro', 'qemu:min-glib', '/var/tmp/qemu/run', 'test-build']' returned non-zero exit status 1
make[1]: *** [tests/docker/Makefile.include:129: docker-run] Error 1
make[1]: Leaving directory '/var/tmp/patchew-tester-tmp-6awfngpj/src'
make: *** [tests/docker/Makefile.include:163: docker-run-test-build@min-glib] Error 2

real	0m51.126s
user	0m9.121s
sys	0m6.557s
=== OUTPUT END ===

Test command exited with code: 2


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