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[Qemu-devel] [PATCH 3/3] xen-disk: use an IOThread per instance
From: |
Paul Durrant |
Subject: |
[Qemu-devel] [PATCH 3/3] xen-disk: use an IOThread per instance |
Date: |
Tue, 20 Jun 2017 09:47:56 -0400 |
This patch allocates an IOThread object for each xen_disk instance and
sets the AIO context appropriately on connect. This allows processing
of I/O to proceed in parallel.
The patch also adds tracepoints into xen_disk to make it possible to
follow the state transtions of an instance in the log.
Signed-off-by: Paul Durrant <address@hidden>
---
Cc: Stefano Stabellini <address@hidden>
Cc: Anthony Perard <address@hidden>
Cc: Kevin Wolf <address@hidden>
Cc: Max Reitz <address@hidden>
---
hw/block/trace-events | 7 +++++++
hw/block/xen_disk.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/hw/block/trace-events b/hw/block/trace-events
index 65e83dc258..608b24ba66 100644
--- a/hw/block/trace-events
+++ b/hw/block/trace-events
@@ -10,3 +10,10 @@ virtio_blk_submit_multireq(void *mrb, int start, int
num_reqs, uint64_t offset,
# hw/block/hd-geometry.c
hd_geometry_lchs_guess(void *blk, int cyls, int heads, int secs) "blk %p LCHS
%d %d %d"
hd_geometry_guess(void *blk, uint32_t cyls, uint32_t heads, uint32_t secs, int
trans) "blk %p CHS %u %u %u trans %d"
+
+# hw/block/xen_disk.c
+xen_disk_alloc(char *name) "%s"
+xen_disk_init(char *name) "%s"
+xen_disk_connect(char *name) "%s"
+xen_disk_disconnect(char *name) "%s"
+xen_disk_free(char *name) "%s"
diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index a9942d32db..ec1085c802 100644
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -27,10 +27,13 @@
#include "hw/xen/xen_backend.h"
#include "xen_blkif.h"
#include "sysemu/blockdev.h"
+#include "sysemu/iothread.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
+#include "qom/object_interfaces.h"
+#include "trace.h"
/* ------------------------------------------------------------- */
@@ -128,6 +131,9 @@ struct XenBlkDev {
DriveInfo *dinfo;
BlockBackend *blk;
QEMUBH *bh;
+
+ IOThread *iothread;
+ AioContext *ctx;
};
/* ------------------------------------------------------------- */
@@ -923,11 +929,31 @@ static void blk_bh(void *opaque)
static void blk_alloc(struct XenDevice *xendev)
{
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
+ Object *obj;
+ char *name;
+ Error *err = NULL;
+
+ trace_xen_disk_alloc(xendev->name);
QLIST_INIT(&blkdev->inflight);
QLIST_INIT(&blkdev->finished);
QLIST_INIT(&blkdev->freelist);
- blkdev->bh = qemu_bh_new(blk_bh, blkdev);
+
+ obj = object_new(TYPE_IOTHREAD);
+ name = g_strdup_printf("iothread-%s", xendev->name);
+
+ object_property_add_child(object_get_objects_root(), name, obj, &err);
+ assert(!err);
+
+ g_free(name);
+
+ user_creatable_complete(obj, &err);
+ assert(!err);
+
+ blkdev->iothread = (IOThread *)object_dynamic_cast(obj, TYPE_IOTHREAD);
+ blkdev->ctx = iothread_get_aio_context(blkdev->iothread);
+ blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev);
+
if (xen_mode != XEN_EMULATE) {
batch_maps = 1;
}
@@ -954,6 +980,8 @@ static int blk_init(struct XenDevice *xendev)
int info = 0;
char *directiosafe = NULL;
+ trace_xen_disk_init(xendev->name);
+
/* read xenstore entries */
if (blkdev->params == NULL) {
char *h = NULL;
@@ -1069,6 +1097,8 @@ static int blk_connect(struct XenDevice *xendev)
unsigned int i;
uint32_t *domids;
+ trace_xen_disk_connect(xendev->name);
+
/* read-only ? */
if (blkdev->directiosafe) {
qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO;
@@ -1285,6 +1315,8 @@ static int blk_connect(struct XenDevice *xendev)
blkdev->persistent_gnt_count = 0;
}
+ blk_set_aio_context(blkdev->blk, blkdev->ctx);
+
xen_be_bind_evtchn(&blkdev->xendev);
xen_pv_printf(&blkdev->xendev, 1, "ok: proto %s, nr-ring-ref %u, "
@@ -1298,13 +1330,20 @@ static void blk_disconnect(struct XenDevice *xendev)
{
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
+ trace_xen_disk_disconnect(xendev->name);
+
+ aio_context_acquire(blkdev->ctx);
+
if (blkdev->blk) {
+ blk_set_aio_context(blkdev->blk, qemu_get_aio_context());
blk_detach_dev(blkdev->blk, blkdev);
blk_unref(blkdev->blk);
blkdev->blk = NULL;
}
xen_pv_unbind_evtchn(&blkdev->xendev);
+ aio_context_release(blkdev->ctx);
+
if (blkdev->sring) {
xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring,
blkdev->nr_ring_ref);
@@ -1338,6 +1377,8 @@ static int blk_free(struct XenDevice *xendev)
struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
struct ioreq *ioreq;
+ trace_xen_disk_free(xendev->name);
+
if (blkdev->blk || blkdev->sring) {
blk_disconnect(xendev);
}
@@ -1355,6 +1396,7 @@ static int blk_free(struct XenDevice *xendev)
g_free(blkdev->dev);
g_free(blkdev->devtype);
qemu_bh_delete(blkdev->bh);
+ object_unparent(OBJECT(blkdev->iothread));
return 0;
}
--
2.11.0
- [Qemu-devel] [PATCH 0/3] xen-disk: performance improvements, Paul Durrant, 2017/06/20
- [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Paul Durrant, 2017/06/20
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Stefano Stabellini, 2017/06/20
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Roger Pau Monné, 2017/06/21
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Paul Durrant, 2017/06/21
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Paul Durrant, 2017/06/21
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Roger Pau Monne, 2017/06/21
- Re: [Qemu-devel] [PATCH 1/3] xen-disk: only advertize feature-persistent if grant copy is not available, Paul Durrant, 2017/06/21
[Qemu-devel] [PATCH 3/3] xen-disk: use an IOThread per instance,
Paul Durrant <=
[Qemu-devel] [PATCH 2/3] xen-disk: add support for multi-page shared rings, Paul Durrant, 2017/06/20