From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7711119413F; Tue, 20 Aug 2024 15:51:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724169065; cv=none; b=LSO0cuZx+iucK+uqZFe2G8eg9vXMXSETwhzer2sDJgoBb1CuwvD6U+YLdBvOxK/JRqP4zpRxcFr346keXISfqELjl8+FWmocXp375bNM7AX32gSKMM2cJO/edAzKM2WAKdrSjTcGZeQEYOwUTWuNOhrow//UlH8qiTBEE7f/hrQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724169065; c=relaxed/simple; bh=rGIBzkp8HH/oBuLYsC10KQZPhbYUpPyarp3pltoH9Yg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=FEzxO0alTleT5Q/+PwjHruh/wxgfYqnOZGipsI6ZTYS1neZDnMg3sixav0j/NhBMyaUzXig5fuHxi1os48EbrVjTkyhURmQPU1MPKShA0p9Tr1odUL28EqkI+vN60mOUOiYDFgKDYHuK4wqu2ca3JbJuQXzE412NfEAlcU36S9g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=TyJUPhS+; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="TyJUPhS+" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rGIBzkp8HH/oBuLYsC10KQZPhbYUpPyarp3pltoH9Yg=; b=TyJUPhS+P0WVQ9LD/p6GrE2ssK AZWevEkllYSMiOeQDpGLxjeNhsI9UKl+Creq4E1/OyyfTr4Yozg5OJOOM4/NvvLHVwbK3wL2GjraP /uRQPOJvt9Ofid0EIt6leapfXu2QYd/lVZH8UyLJpHClzzZGq/vwetE2CBqIOxLdaD4RbN9mrEIW3 7LRlej6lwW+J4Y/5atIsA+C3M0PBx7Nx9ne04tYfJgSsyowMiqumkEouGm8MLDF/r9GE+9zilnuhP xLqyeJMpkkMPMe27QdbMz8EaxwMfrEWn4bGIabQY2w+it+gdp0LJ5WgLWVPDgl5wDDS9a53Sq26qU KYj7URmQ==; Received: from [2001:8b0:10b:5:cb53:8564:1f06:36f6] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgR8I-000000087lP-3BRj; Tue, 20 Aug 2024 15:50:55 +0000 Message-ID: <185314eedbe4e19a2a1cd7faf32b9a3a3e6acd07.camel@infradead.org> Subject: Re: [PATCH] sched: Don't try to catch up excess steal time. From: David Woodhouse To: Suleiman Souhlal , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot Cc: Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Paolo Bonzini , joelaf@google.com, vineethrp@google.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, ssouhlal@freebsd.org Date: Tue, 20 Aug 2024 16:50:53 +0100 In-Reply-To: <20240806111157.1336532-1-suleiman@google.com> References: <20240806111157.1336532-1-suleiman@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-RmKwVGWg8jyBo6PSpONC" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-RmKwVGWg8jyBo6PSpONC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-08-06 at 20:11 +0900, Suleiman Souhlal wrote: > When steal time exceeds the measured delta when updating clock_task, we > currently try to catch up the excess in future updates. > However, this results in inaccurate run times for the future clock_task > measurements, as they end up getting additional steal time that did not > actually happen, from the previous excess steal time being paid back. >=20 > For example, suppose a task in a VM runs for 10ms and had 15ms of steal > time reported while it ran. clock_task rightly doesn't advance. Then, a > different task runs on the same rq for 10ms without any time stolen. > Because of the current catch up mechanism, clock_sched inaccurately ends > up advancing by only 5ms instead of 10ms even though there wasn't any > actual time stolen. The second task is getting charged for less time > than it ran, even though it didn't deserve it. > In other words, tasks can end up getting more run time than they should > actually get. >=20 > So, we instead don't make future updates pay back past excess stolen time= . My understanding was that it was done this way for a reason: there is a lot of jitter between the "run time" (your 10ms example), and the steal time (15ms). What if 5ms really *did* elapse between the time that 'delta' is calculated, and the call to paravirt_steal_clock()? By accounting that steal time "in advance" we ensure it isn't lost in the case where the same process remains running for the next timeslice. However, that does cause problems when the steal time goes negative (due to hypervisor bugs). So in=20 https://lore.kernel.org/all/20240522001817.619072-22-dwmw2@infradead.org/ I limited the amount of time which would be accounted to a future tick. > Signed-off-by: Suleiman Souhlal > --- > =C2=A0kernel/sched/core.c | 6 ++++-- > =C2=A01 file changed, 4 insertions(+), 2 deletions(-) >=20 > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index bcf2c4cc0522..42b37da2bda6 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -728,13 +728,15 @@ static void update_rq_clock_task(struct rq *rq, s64= delta) > =C2=A0#endif > =C2=A0#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (static_key_false((&pa= ravirt_steal_rq_enabled))) { > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0steal =3D paravirt_steal_clock(cpu_of(rq)); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0u64 prev_steal; > + > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0steal =3D prev_steal =3D paravirt_steal_clock(cpu_of(rq))= ; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0steal -=3D rq->prev_steal_time_rq; > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0if (unlikely(steal > delta)) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ste= al =3D delta; > =C2=A0 > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0rq->prev_steal_time_rq +=3D steal; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0rq->prev_steal_time_rq =3D prev_steal; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0delta -=3D steal; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} > =C2=A0#endif --=-RmKwVGWg8jyBo6PSpONC Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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