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Peter Xu b4c82b4288 migration/postcopy: Report fault latencies in blocktime 
Blocktime so far only cares about the time one vcpu (or the whole system)
got blocked.  It would be also be helpful if it can also report the latency
of page requests, which could be very sensitive during postcopy.

Blocktime itself is sometimes not very important, especially when one
thinks about KVM async PF support, which means vCPUs are literally almost
not blocked at all because the guest OS is smart enough to switch to
another task when a remote fault is needed.

However, latency is still sensitive and important because even if the guest
vCPU is running on threads that do not need a remote fault, the workload
that accesses some missing page is still affected.

Add two entries to the report, showing how long it takes to resolve a
remote fault.  Mention in the QAPI doc that this is not the real average
fault latency, but only the ones that was requested for a remote fault.

Unwrap get_vcpu_blocktime_list() so we don't need to walk the list twice,
meanwhile add the entry checks in qtests for all postcopy tests.

Cc: Markus Armbruster <armbru@redhat.com>
Cc: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Link: https://lore.kernel.org/r/20250613141217.474825-9-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
2025-07-11 10:37:38 -03:00
..
acpi.json qapi: Tidy up run-together sentences in doc comments 2025-06-03 08:34:56 +02:00
audio.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
authz.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
block-core.json qapi: Improve documentation around job state @concluded 2025-06-03 08:34:57 +02:00
block-export.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
block.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
char.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
common.json hw/qdev-properties-system: Introduce EndianMode QAPI enum 2025-02-16 14:33:39 +01:00
compat.json qapi: Belatedly update CompatPolicy documentation for unstable 2023-10-19 07:02:29 +02:00
control.json qapi: use imperative style in documentation 2025-05-28 18:59:12 +02:00
crypto.json qapi: Tidy up whitespace in doc comments 2025-06-03 08:34:56 +02:00
cryptodev.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
cxl.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
dump.json qapi: Use proper markup instead of CAPS for emphasis in doc comments 2025-06-03 08:34:57 +02:00
ebpf.json qapi/ebpf: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
error.json qapi: Reformat doc comments to conform to current conventions 2023-05-10 10:01:01 +02:00
introspect.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
job.json qapi: Improve documentation around job state @concluded 2025-06-03 08:34:57 +02:00
machine-common.json qapi/qom: Define cache enumeration and properties for machine 2024-11-05 23:32:25 +00:00
machine-s390x.json qapi: make s390x specific CPU commands unconditionally available 2025-05-28 18:56:08 +02:00
machine.json accel/tcg: Remove 'info opcount' and @x-query-opcount 2025-07-04 12:07:59 +02:00
meson.build qapi: make all generated files common 2025-05-28 18:56:08 +02:00
migration.json migration/postcopy: Report fault latencies in blocktime 2025-07-11 10:37:38 -03:00
misc-arm.json qapi: expose query-gic-capability command unconditionally 2025-05-28 18:54:18 +02:00
misc-i386.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
misc.json qapi: Use proper markup instead of CAPS for emphasis in doc comments 2025-06-03 08:34:57 +02:00
net.json qapi: Avoid breaking lines within (since X.Y) 2025-06-03 08:34:56 +02:00
opts-visitor.c qapi: Inline and remove QERR_INVALID_PARAMETER definition 2024-04-24 09:50:58 +02:00
pci.json qapi/pci: Supply missing member documentation 2024-10-02 09:10:01 +02:00
pragma.json qapi: Document QCryptodevBackendServiceType 2024-10-02 09:10:01 +02:00
qapi-clone-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qapi-dealloc-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qapi-forward-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qapi-schema.json qapi: make s390x specific CPU commands unconditionally available 2025-05-28 18:56:08 +02:00
qapi-type-helpers.c qapi: New strv_from_str_list() 2024-03-04 07:12:40 +01:00
qapi-util.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qapi-visit-core.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qdev.json docs: Fix some typos (found by codespell and typos) 2025-04-13 13:45:04 +03:00
qmp-dispatch.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qmp-event.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qmp-registry.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qobject-input-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qobject-output-visitor.c qapi: change 'unsigned special_features' to 'uint64_t features' 2025-02-10 15:45:04 +01:00
qom.json i386/tdx: handle TDG.VP.VMCALL<GetQuote> 2025-06-20 13:25:59 +02:00
replay.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
rocker.json qapi/rocker: Tidy up query-rocker-of-dpa-flows example 2025-04-08 09:04:20 +02:00
run-state.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
sockets.json util/qemu-sockets: Introduce inet socket options controlling TCP keep-alive 2025-05-22 11:24:41 +01:00
stats.json qapi: Refill doc comments to conform to conventions 2024-08-05 09:31:51 +02:00
string-input-visitor.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
string-output-visitor.c string-output-visitor: Fix (pseudo) struct handling 2024-01-26 11:16:58 +01:00
tpm.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
trace-events qapi: Generalize struct member policy checking 2021-10-29 18:23:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
trace.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00
transaction.json qapi: Fix capitalization in doc comments 2025-06-03 08:34:57 +02:00
uefi.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
ui.json qapi: Correct spelling of QEMU in doc comments 2025-06-03 08:34:56 +02:00
vfio.json qapi/vfio: Rename VfioMigrationState to Qapi*, and drop prefix 2024-09-10 14:03:45 +02:00
virtio.json qapi: use imperative style in documentation 2025-05-28 18:59:12 +02:00
yank.json qapi: convert "Example" sections without titles 2024-07-17 10:20:53 +02:00