|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 25/29] tools/libxl: Write checkpoint records into the stream
when signalled to do so by libxl__remus_domain_checkpoint_callback()
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
---
v3: Corrections to comments
This patch has changed substantially in v2 as a result of changes earlier in
the series. No behavioural difference from v1.
---
tools/libxl/libxl_dom.c | 18 ++++-----
tools/libxl/libxl_internal.h | 7 ++++
tools/libxl/libxl_stream_write.c | 81 ++++++++++++++++++++++++++++++++++++--
3 files changed, 93 insertions(+), 13 deletions(-)
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index cda3a7a..927a10e 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -1937,8 +1937,8 @@ static void remus_devices_preresume_cb(libxl__egc *egc,
/*----- remus asynchronous checkpoint callback -----*/
-static void remus_checkpoint_dm_saved(libxl__egc *egc,
- libxl__domain_suspend_state *dss, int
rc);
+static void remus_checkpoint_stream_written(
+ libxl__egc *egc, libxl__stream_write_state *sws, int rc);
static void remus_devices_commit_cb(libxl__egc *egc,
libxl__remus_devices_state *rds,
int rc);
@@ -1953,17 +1953,14 @@ static void
libxl__remus_domain_checkpoint_callback(void *data)
libxl__egc *egc = shs->egc;
STATE_AO_GC(dss->ao);
- /* This would go into tailbuf. */
- if (dss->hvm) {
- libxl__domain_save_device_model(egc, dss, remus_checkpoint_dm_saved);
- } else {
- remus_checkpoint_dm_saved(egc, dss, 0);
- }
+ libxl__stream_write_start_checkpoint(egc, &dss->sws);
}
-static void remus_checkpoint_dm_saved(libxl__egc *egc,
- libxl__domain_suspend_state *dss, int rc)
+static void remus_checkpoint_stream_written(
+ libxl__egc *egc, libxl__stream_write_state *sws, int rc)
{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(sws, *dss, sws);
+
/* Convenience aliases */
libxl__remus_devices_state *const rds = &dss->rds;
@@ -2113,6 +2110,7 @@ void libxl__domain_suspend(libxl__egc *egc,
libxl__domain_suspend_state *dss)
callbacks->suspend = libxl__remus_domain_suspend_callback;
callbacks->postcopy = libxl__remus_domain_resume_callback;
callbacks->checkpoint = libxl__remus_domain_checkpoint_callback;
+ dss->sws.checkpoint_callback = remus_checkpoint_stream_written;
} else
callbacks->suspend = libxl__domain_suspend_callback;
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 0697ba6..9961a53 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2968,9 +2968,13 @@ struct libxl__stream_write_state {
void (*completion_callback)(libxl__egc *egc,
libxl__stream_write_state *sws,
int rc);
+ void (*checkpoint_callback)(libxl__egc *egc,
+ libxl__stream_write_state *sws,
+ int rc);
/* Private */
int rc;
bool running;
+ bool in_checkpoint;
libxl__save_helper_state shs;
/* Main stream-writing data. */
@@ -2987,6 +2991,9 @@ struct libxl__stream_write_state {
_hidden void libxl__stream_write_init(libxl__stream_write_state *stream);
_hidden void libxl__stream_write_start(libxl__egc *egc,
libxl__stream_write_state *stream);
+_hidden void
+libxl__stream_write_start_checkpoint(libxl__egc *egc,
+ libxl__stream_write_state *stream);
_hidden void libxl__stream_write_abort(libxl__egc *egc,
libxl__stream_write_state *stream,
int rc);
diff --git a/tools/libxl/libxl_stream_write.c b/tools/libxl/libxl_stream_write.c
index d1343e0..944a87b 100644
--- a/tools/libxl/libxl_stream_write.c
+++ b/tools/libxl/libxl_stream_write.c
@@ -22,6 +22,8 @@
* Entry points from outside:
* - libxl__stream_write_start()
* - Start writing a stream from the start.
+ * - libxl__stream_write_start_checkpoint()
+ * - Write the records which form a checkpoint into a stream.
*
* In normal operation, there are two tasks running at once; this
* stream processing, and the libxl-save-helper. check_all_finished()
@@ -39,6 +41,12 @@
* - Toolstack record
* - if (hvm), Qemu record
* - End record
+ *
+ * For checkpointed stream, there is a second loop which is triggered by a
+ * save-helper checkpoint callback. It writes:
+ * - Toolstack record
+ * - if (hvm), Qemu record
+ * - Checkpoint end record
*/
/* Success/error/cleanup handling. */
@@ -48,6 +56,9 @@ static void stream_complete(libxl__egc *egc,
libxl__stream_write_state *stream, int rc);
static void stream_done(libxl__egc *egc,
libxl__stream_write_state *stream);
+static void checkpoint_done(libxl__egc *egc,
+ libxl__stream_write_state *stream,
+ int rc);
static void check_all_finished(libxl__egc *egc,
libxl__stream_write_state *stream, int rc);
@@ -72,6 +83,12 @@ static void emulator_record_done(libxl__egc *egc,
static void write_end_record(libxl__egc *egc,
libxl__stream_write_state *stream);
+/* Event chain unique to checkpointed streams. */
+static void write_checkpoint_end_record(libxl__egc *egc,
+ libxl__stream_write_state *stream);
+static void checkpoint_end_record_done(libxl__egc *egc,
+ libxl__stream_write_state *stream);
+
/*----- Helpers -----*/
static void write_done(libxl__egc *egc,
@@ -140,6 +157,7 @@ void libxl__stream_write_init(libxl__stream_write_state
*stream)
{
stream->rc = 0;
stream->running = false;
+ stream->in_checkpoint = false;
FILLZERO(stream->dc);
stream->record_done_callback = NULL;
FILLZERO(stream->emu_dc);
@@ -184,6 +202,16 @@ void libxl__stream_write_start(libxl__egc *egc,
stream_complete(egc, stream, rc);
}
+void libxl__stream_write_start_checkpoint(libxl__egc *egc,
+ libxl__stream_write_state *stream)
+{
+ assert(stream->running);
+ assert(!stream->in_checkpoint);
+ stream->in_checkpoint = true;
+
+ write_toolstack_record(egc, stream);
+}
+
void libxl__stream_write_abort(libxl__egc *egc,
libxl__stream_write_state *stream, int rc)
{
@@ -290,8 +318,12 @@ static void toolstack_record_done(libxl__egc *egc,
if (dss->type == LIBXL_DOMAIN_TYPE_HVM)
write_emulator_record(egc, stream);
- else
- write_end_record(egc, stream);
+ else {
+ if (stream->in_checkpoint)
+ write_checkpoint_end_record(egc, stream);
+ else
+ write_end_record(egc, stream);
+ }
}
static void write_emulator_record(libxl__egc *egc,
@@ -397,7 +429,10 @@ static void emulator_record_done(libxl__egc *egc,
free(stream->emu_body);
stream->emu_body = NULL;
- write_end_record(egc, stream);
+ if (stream->in_checkpoint)
+ write_checkpoint_end_record(egc, stream);
+ else
+ write_end_record(egc, stream);
}
static void write_end_record(libxl__egc *egc,
@@ -412,6 +447,24 @@ static void write_end_record(libxl__egc *egc,
&rec, NULL, stream_success);
}
+static void write_checkpoint_end_record(libxl__egc *egc,
+ libxl__stream_write_state *stream)
+{
+ struct libxl__sr_rec_hdr rec;
+
+ FILLZERO(rec);
+ rec.type = REC_TYPE_CHECKPOINT_END;
+
+ setup_write(egc, stream, "checkpoint end record",
+ &rec, NULL, checkpoint_end_record_done);
+}
+
+static void checkpoint_end_record_done(libxl__egc *egc,
+ libxl__stream_write_state *stream)
+{
+ checkpoint_done(egc, stream, 0);
+}
+
/*----- Success/error/cleanup handling. -----*/
static void stream_success(libxl__egc *egc, libxl__stream_write_state *stream)
@@ -424,6 +477,18 @@ static void stream_complete(libxl__egc *egc,
{
assert(stream->running);
+ if (stream->in_checkpoint) {
+ assert(rc);
+
+ /*
+ * If an error is encountered while in a checkpoint, pass it
+ * back to libxc. The failure will come back around to us via
+ * libxl__xc_domain_save_done()
+ */
+ checkpoint_done(egc, stream, rc);
+ return;
+ }
+
if (!stream->rc)
stream->rc = rc;
stream_done(egc, stream);
@@ -442,6 +507,16 @@ static void stream_done(libxl__egc *egc,
check_all_finished(egc, stream, stream->rc);
}
+static void checkpoint_done(libxl__egc *egc,
+ libxl__stream_write_state *stream,
+ int rc)
+{
+ assert(stream->in_checkpoint);
+
+ stream->in_checkpoint = false;
+ stream->checkpoint_callback(egc, stream, rc);
+}
+
static void check_all_finished(libxl__egc *egc,
libxl__stream_write_state *stream,
int rc)
--
1.7.10.4
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |