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bh=Afq2KYMYYL/Thf/uD8cq+0jXlmbxqDVWTWRLkkwZEnM=; b=X1u1Vh/J2gGNhySd3aEJflSbRBprM7qRp4crKBPz/I5dBWXcIxJqmhblJ5XRsFGrN6GVOr V6w07HMWA7nUdFqFkGUucjGNFgAC36yztw3euW9yAAiLvkWzt9zGtLQHmTlNqoi95rftwB T/OVinYRHdLM4rrj16Wb6dqXa5bbJHg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1752243043; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Afq2KYMYYL/Thf/uD8cq+0jXlmbxqDVWTWRLkkwZEnM=; b=pcVwHQmnIZFugjh8AxQ6kZj6wEEi3Odm5S7o7SbezsjdCqVVIJUfnZAgxe5vaGUfNg2vic A/CNUR0+IawchTAg== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu , Juraj Marcin Subject: [PULL 03/26] migration/docs: Move docs for postcopy blocktime feature Date: Fri, 11 Jul 2025 11:10:08 -0300 Message-Id: <20250711141031.423-4-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20250711141031.423-1-farosas@suse.de> References: <20250711141031.423-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-2.80 / 50.00]; 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charset="utf-8" From: Peter Xu Move it out of vanilla postcopy session, but instead a standalone feature. When at it, removing the NOTE because it's incorrect now after introduction of max-postcopy-bandwidth, which can control the throughput even for postcopy phase. Reviewed-by: Juraj Marcin Link: https://lore.kernel.org/r/20250613140801.474264-4-peterx@redhat.com Signed-off-by: Peter Xu Signed-off-by: Fabiano Rosas --- docs/devel/migration/postcopy.rst | 36 +++++++++++++++---------------- 1 file changed, 17 insertions(+), 19 deletions(-) diff --git a/docs/devel/migration/postcopy.rst b/docs/devel/migration/postc= opy.rst index 82e7a848c6..e319388d8f 100644 --- a/docs/devel/migration/postcopy.rst +++ b/docs/devel/migration/postcopy.rst @@ -33,25 +33,6 @@ will now cause the transition from precopy to postcopy. It can be issued immediately after migration is started or any time later on. Issuing it after the end of a migration is harmless. =20 -Blocktime is a postcopy live migration metric, intended to show how -long the vCPU was in state of interruptible sleep due to pagefault. -That metric is calculated both for all vCPUs as overlapped value, and -separately for each vCPU. These values are calculated on destination -side. To enable postcopy blocktime calculation, enter following -command on destination monitor: - -``migrate_set_capability postcopy-blocktime on`` - -Postcopy blocktime can be retrieved by query-migrate qmp command. -postcopy-blocktime value of qmp command will show overlapped blocking -time for all vCPU, postcopy-vcpu-blocktime will show list of blocking -time per vCPU. - -.. note:: - During the postcopy phase, the bandwidth limits set using - ``migrate_set_parameter`` is ignored (to avoid delaying requested pages = that - the destination is waiting for). - Postcopy internals =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 @@ -312,3 +293,20 @@ explicitly) to be sent in a separate preempt channel, = rather than queued in the background migration channel. Anyone who cares about latencies of page faults during a postcopy migration should enable this feature. By default, it's not enabled. + +Postcopy blocktime statistics +----------------------------- + +Blocktime is a postcopy live migration metric, intended to show how +long the vCPU was in state of interruptible sleep due to pagefault. +That metric is calculated both for all vCPUs as overlapped value, and +separately for each vCPU. These values are calculated on destination +side. To enable postcopy blocktime calculation, enter following +command on destination monitor: + +``migrate_set_capability postcopy-blocktime on`` + +Postcopy blocktime can be retrieved by query-migrate qmp command. +postcopy-blocktime value of qmp command will show overlapped blocking +time for all vCPU, postcopy-vcpu-blocktime will show list of blocking +time per vCPU. --=20 2.35.3