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132 lines
5.4 KiB
132 lines
5.4 KiB
From 8ea558c6eff6cc3b968b1124ad4e005bb3844d74 Mon Sep 17 00:00:00 2001
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Message-ID: <8ea558c6eff6cc3b968b1124ad4e005bb3844d74.1771336751.git.jdenemar@redhat.com>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Fri, 23 Jan 2026 17:18:14 +0100
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Subject: [PATCH] qemu: Setup disk latency histograms on startup/hotplug/update
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Setup the histograms on startup and hotplug of devices via
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'qemuProcessSetupDiskPropsRuntime' and facilitate update/reset/disable
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of histogram collection via 'qemuDomainChangeDiskLive'.
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The latter allows to use the update device API to either clear the bins
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or select new bin configuration or disable the histogram altogether
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without the need for a specific API.
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 5787326541be4eafaa7ae3b4f866b3da793d44fe)
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https://issues.redhat.com/browse/RHEL-147866 [rhel-9.8]
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https://issues.redhat.com/browse/RHEL-131335 [rhel-10.2]
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---
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src/qemu/qemu_domain.c | 17 +++++++++++++++++
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src/qemu/qemu_domain.h | 3 +++
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src/qemu/qemu_hotplug.c | 29 +++++++++++++++++++++++++++++
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src/qemu/qemu_process.c | 10 ++++++++++
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4 files changed, 59 insertions(+)
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diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
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index 8e1ebe7799..bdab117e96 100644
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--- a/src/qemu/qemu_domain.c
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+++ b/src/qemu/qemu_domain.c
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@@ -10463,6 +10463,23 @@ qemuDomainInitializePflashStorageSource(virDomainObj *vm,
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}
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+/**
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+ * qemuDomainDiskHasLatencyHistogram:
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+ * @disk: disk definition
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+ *
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+ * Returns whether @disk has any latency histogram settings configured.
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+ */
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+bool
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+qemuDomainDiskHasLatencyHistogram(virDomainDiskDef *disk)
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+{
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+ return disk->histogram_boundaries ||
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+ disk->histogram_boundaries_read ||
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+ disk->histogram_boundaries_write ||
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+ disk->histogram_boundaries_zone ||
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+ disk->histogram_boundaries_flush;
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+}
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+
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+
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/**
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* qemuDomainDiskBlockJobIsSupported:
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*
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diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
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index 3361e97315..30ca67bf76 100644
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--- a/src/qemu/qemu_domain.h
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+++ b/src/qemu/qemu_domain.h
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@@ -1078,6 +1078,9 @@ int
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qemuDomainInitializePflashStorageSource(virDomainObj *vm,
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virQEMUDriverConfig *cfg);
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+bool
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+qemuDomainDiskHasLatencyHistogram(virDomainDiskDef *disk);
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+
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bool
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qemuDomainDiskBlockJobIsSupported(virDomainDiskDef *disk);
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diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
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index f2dc4469a3..9445599d2c 100644
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--- a/src/qemu/qemu_hotplug.c
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+++ b/src/qemu/qemu_hotplug.c
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@@ -7310,6 +7310,35 @@ qemuDomainChangeDiskLive(virDomainObj *vm,
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dev->data.disk->src = NULL;
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}
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+ if (qemuDomainDiskHasLatencyHistogram(disk) ||
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+ qemuDomainDiskHasLatencyHistogram(orig_disk)) {
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+ int rc;
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+
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+ qemuDomainObjEnterMonitor(vm);
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+ rc = qemuMonitorBlockLatencyHistogramSet(qemuDomainGetMonitor(vm),
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+ QEMU_DOMAIN_DISK_PRIVATE(orig_disk)->qomName,
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+ disk->histogram_boundaries,
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+ disk->histogram_boundaries_read,
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+ disk->histogram_boundaries_write,
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+ disk->histogram_boundaries_zone,
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+ disk->histogram_boundaries_flush);
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+ qemuDomainObjExitMonitor(vm);
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+
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+ if (rc < 0)
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+ return -1;
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+
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+ g_clear_pointer(&orig_disk->histogram_boundaries, g_free);
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+ g_clear_pointer(&orig_disk->histogram_boundaries_read, g_free);
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+ g_clear_pointer(&orig_disk->histogram_boundaries_write, g_free);
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+ g_clear_pointer(&orig_disk->histogram_boundaries_zone, g_free);
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+ g_clear_pointer(&orig_disk->histogram_boundaries_flush, g_free);
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+ orig_disk->histogram_boundaries = g_steal_pointer(&disk->histogram_boundaries);
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+ orig_disk->histogram_boundaries_read = g_steal_pointer(&disk->histogram_boundaries_read);
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+ orig_disk->histogram_boundaries_write = g_steal_pointer(&disk->histogram_boundaries_write);
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+ orig_disk->histogram_boundaries_zone = g_steal_pointer(&disk->histogram_boundaries_zone);
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+ orig_disk->histogram_boundaries_flush = g_steal_pointer(&disk->histogram_boundaries_flush);
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+ }
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+
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/* in case when we aren't updating disk source we update startup policy here */
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orig_disk->startupPolicy = dev->data.disk->startupPolicy;
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orig_disk->snapshot = dev->data.disk->snapshot;
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diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
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index aadfaa92b0..37e688018c 100644
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--- a/src/qemu/qemu_process.c
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+++ b/src/qemu/qemu_process.c
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@@ -7959,6 +7959,16 @@ qemuProcessSetupDiskPropsRuntime(qemuMonitor *mon,
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&disk->blkdeviotune) < 0)
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return -1;
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+ if (qemuDomainDiskHasLatencyHistogram(disk) &&
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+ qemuMonitorBlockLatencyHistogramSet(mon,
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+ QEMU_DOMAIN_DISK_PRIVATE(disk)->qomName,
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+ disk->histogram_boundaries,
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+ disk->histogram_boundaries_read,
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+ disk->histogram_boundaries_write,
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+ disk->histogram_boundaries_zone,
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+ disk->histogram_boundaries_flush) < 0)
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+ return -1;
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+
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return 0;
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}
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--
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2.53.0
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