From: Anchal Agarwal <anchalag@amazon.com>
To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
<hpa@zytor.com>, <x86@kernel.org>, <boris.ostrovsky@oracle.com>,
<jgross@suse.com>, <linux-pm@vger.kernel.org>,
<linux-mm@kvack.org>, <kamatam@amazon.com>,
<sstabellini@kernel.org>, <konrad.wilk@oracle.com>,
<roger.pau@citrix.com>, <axboe@kernel.dk>, <davem@davemloft.net>,
<rjw@rjwysocki.net>, <len.brown@intel.com>, <pavel@ucw.cz>,
<peterz@infradead.org>, <eduval@amazon.com>, <sblbir@amazon.com>,
<anchalag@amazon.com>, <xen-devel@lists.xenproject.org>,
<vkuznets@redhat.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <dwmw@amazon.co.uk>,
<benh@kernel.crashing.org>
Subject: [PATCH v3 08/11] x86/xen: save and restore steal clock during PM hibernation
Date: Fri, 21 Aug 2020 22:29:55 +0000 [thread overview]
Message-ID: <5c3be5c7519b1f63a51b08abc388c33bd6f66661.1598042152.git.anchalag@amazon.com> (raw)
In-Reply-To: <cover.1598042152.git.anchalag@amazon.com>
Save/restore steal times in syscore suspend/resume during PM
hibernation. Commit '5e25f5db6abb9: ("xen/time: do not
decrease steal time after live migration on xen")' fixes xen
guest steal time handling during migration. A similar issue is seen
during PM hibernation.
Currently, steal time accounting code in scheduler expects steal clock
callback to provide monotonically increasing value. If the accounting
code receives a smaller value than previous one, it uses a negative
value to calculate steal time and results in incorrectly updated idle
and steal time accounting. This breaks userspace tools which read
/proc/stat.
top - 08:05:35 up 2:12, 3 users, load average: 0.00, 0.07, 0.23
Tasks: 80 total, 1 running, 79 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,30100.0%id, 0.0%wa, 0.0%hi, 0.0%si,-1253874204672.0%st
This can actually happen when a Xen PVHVM guest gets restored from
hibernation, because such a restored guest is just a fresh domain from
Xen perspective and the time information in runstate info starts over
from scratch.
Changelog:
v1->v2: Removed patches that introduced new function calls for saving/restoring
sched clock offset and using existing ones that are used during LM
Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
---
arch/x86/xen/suspend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index 550aa0fc9465..b12db6966af6 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -99,6 +99,7 @@ static int xen_syscore_suspend(void)
gnttab_suspend();
+ xen_manage_runstate_time(-1);
xrfp.domid = DOMID_SELF;
xrfp.gpfn = __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT;
@@ -119,7 +120,7 @@ static void xen_syscore_resume(void)
xen_hvm_map_shared_info();
pvclock_resume();
-
+ xen_manage_runstate_time(0);
gnttab_resume();
}
--
2.16.6
next prev parent reply other threads:[~2020-08-21 22:30 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 22:22 [PATCH v3 00/11] Fix PM hibernation in Xen guests Anchal Agarwal
2020-08-21 22:25 ` [PATCH v3 01/11] xen/manage: keep track of the on-going suspend mode Anchal Agarwal
2020-09-13 15:43 ` boris.ostrovsky
2020-09-14 21:47 ` Anchal Agarwal
2020-09-15 0:24 ` boris.ostrovsky
2020-09-15 18:00 ` Anchal Agarwal
2020-09-15 19:58 ` boris.ostrovsky
2020-09-21 21:54 ` Anchal Agarwal
2020-09-22 16:18 ` boris.ostrovsky
2020-09-22 23:17 ` Anchal Agarwal
[not found] ` <20200925190423.GA31885@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>
2020-09-25 20:02 ` boris.ostrovsky
2020-09-25 22:28 ` Anchal Agarwal
2020-09-28 18:49 ` boris.ostrovsky
2020-09-30 21:29 ` Anchal Agarwal
2020-10-01 12:43 ` boris.ostrovsky
2021-05-21 5:26 ` Anchal Agarwal
2021-05-25 22:23 ` Boris Ostrovsky
2021-05-26 4:40 ` Anchal Agarwal
2021-05-26 18:29 ` Boris Ostrovsky
[not found] ` <20210528215008.GA19622@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>
2021-06-01 14:18 ` Boris Ostrovsky
2021-06-02 19:37 ` Anchal Agarwal
2021-06-03 20:11 ` Boris Ostrovsky
2021-06-03 23:27 ` Anchal Agarwal
2021-06-04 1:49 ` Boris Ostrovsky
2020-09-13 17:07 ` boris.ostrovsky
2020-08-21 22:26 ` [PATCH v3 02/11] xenbus: add freeze/thaw/restore callbacks support Anchal Agarwal
2020-09-13 16:11 ` boris.ostrovsky
2020-09-15 19:56 ` Anchal Agarwal
2020-08-21 22:26 ` [PATCH v3 03/11] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
2020-08-21 22:27 ` [PATCH v3 04/11] x86/xen: add system core suspend and resume callbacks Anchal Agarwal
2020-09-13 17:25 ` boris.ostrovsky
2020-08-21 22:27 ` [PATCH v3 05/11] genirq: Shutdown irq chips in suspend/resume during hibernation Thomas Gleixner
2020-08-22 0:36 ` Thomas Gleixner
2020-08-24 17:25 ` Anchal Agarwal
2020-08-25 13:20 ` Christoph Hellwig
2020-08-25 15:25 ` Thomas Gleixner
2020-08-21 22:28 ` [PATCH v3 06/11] xen-blkfront: add callbacks for PM suspend and hibernation Anchal Agarwal
2020-08-21 22:29 ` [PATCH v3 07/11] xen-netfront: " Anchal Agarwal
2020-08-21 22:29 ` Anchal Agarwal [this message]
2020-08-21 22:30 ` [PATCH v3 09/11] xen: Introduce wrapper for save/restore sched clock offset Anchal Agarwal
2020-08-21 22:30 ` [PATCH v3 10/11] xen: Update sched clock offset to avoid system instability in hibernation Anchal Agarwal
2020-09-13 17:52 ` boris.ostrovsky
2020-08-21 22:31 ` [PATCH v3 11/11] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2020-08-28 18:26 ` [PATCH v3 00/11] Fix PM hibernation in Xen guests Anchal Agarwal
2020-08-28 18:29 ` Rafael J. Wysocki
2020-08-28 18:39 ` Anchal Agarwal
2020-09-11 20:44 ` Anchal Agarwal
2020-09-11 15:19 ` boris.ostrovsky
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