From: Pavel Tatashin <pasha.tatashin@oracle.com>
To: peterz@infradead.org
Cc: Steven Sistare <steven.sistare@oracle.com>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
linux@armlinux.org.uk, schwidefsky@de.ibm.com,
Heiko Carstens <heiko.carstens@de.ibm.com>,
John Stultz <john.stultz@linaro.org>,
sboyd@codeaurora.org, x86@kernel.org,
LKML <linux-kernel@vger.kernel.org>,
mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com,
douly.fnst@cn.fujitsu.com, prarit@redhat.com,
feng.tang@intel.com, Petr Mladek <pmladek@suse.com>,
gnomes@lxorguk.ukuu.org.uk, linux-s390@vger.kernel.org,
boris.ostrovsky@oracle.com, jgross@suse.com, pbonzini@redhat.com
Subject: Re: [PATCH v14 24/25] sched: early boot clock
Date: Thu, 19 Jul 2018 10:16:34 -0400 [thread overview]
Message-ID: <CAGM2rebsqJUBSVhN3Ug=wYA+uYzKF06P4afDqEApaWk0bK8-zQ@mail.gmail.com> (raw)
In-Reply-To: <20180719103903.GB2494@hirez.programming.kicks-ass.net>
On Thu, Jul 19, 2018 at 6:40 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Tue, Jul 17, 2018 at 10:22:10PM -0400, Pavel Tatashin wrote:
>
> > diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
> > index 0e9dbb2d9aea..7a8a63b940ee 100644
> > --- a/kernel/sched/clock.c
> > +++ b/kernel/sched/clock.c
> > @@ -202,7 +202,15 @@ static void __sched_clock_gtod_offset(void)
> >
> > void __init sched_clock_init(void)
> > {
> > + unsigned long flags;
> > +
> > sched_clock_running = 1;
> > +
> > + /* Adjust __gtod_offset for contigious transition from early clock */
> > + local_irq_save(flags);
> > + sched_clock_tick();
> > + local_irq_restore(flags);
> > + __sched_clock_gtod_offset();
>
> I think we want to keep __sched_clock_gtod_offset() inside the IRQ
> disabled region.
Fixed.
>
> And I just looked at my patch:
>
> https://lkml.kernel.org/r/20180626090003.GA2458@hirez.programming.kicks-ass.net
>
> and that had a comment about how we wanted to set the gtod offset
> _before_ setting sched_clock_running, yet here you do it the other way
> around. Hmm?
Fixed, and added your comment.
Thank you,
Pavel
next prev parent reply other threads:[~2018-07-19 14:17 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 2:21 [PATCH v14 00/25] Early boot time stamps Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 01/25] x86/kvmclock: Remove memblock dependency Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 02/25] x86/kvmclock: Remove page size requirement from wall_clock Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 03/25] x86/kvmclock: Decrapify kvm_register_clock() Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 04/25] x86/kvmclock: Cleanup the code Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 05/25] x86/kvmclock: Mark variables __initdata and __ro_after_init Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 06/25] x86/kvmclock: Move kvmclock vsyscall param and init to kvmclock Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 07/25] x86/kvmclock: Switch kvmclock data to a PER_CPU variable Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 08/25] x86/kvmclock: Avoid TSC recalibration Pavel Tatashin
2018-07-18 11:14 ` Paolo Bonzini
2018-07-18 13:33 ` Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 09/25] x86: text_poke() may access uninitialized struct pages Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 10/25] x86: initialize static branching early Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 11/25] x86/CPU: Call detect_nopl() only on the BSP Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 12/25] x86/tsc: redefine notsc to behave as tsc=unstable Pavel Tatashin
2018-07-18 2:21 ` [PATCH v14 13/25] x86/xen/time: initialize pv xen time in init_hypervisor_platform Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 14/25] x86/xen/time: output xen sched_clock time from 0 Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 15/25] s390/time: add read_persistent_wall_and_boot_offset() Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 16/25] time: replace read_boot_clock64() with read_persistent_wall_and_boot_offset() Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 17/25] time: default boot time offset to local_clock() Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 18/25] s390/time: remove read_boot_clock64() Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 19/25] ARM/time: " Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 20/25] x86/tsc: calibrate tsc only once Pavel Tatashin
2018-07-19 5:33 ` Dou Liyang
2018-07-19 6:25 ` Thomas Gleixner
2018-07-19 6:48 ` Dou Liyang
2018-07-19 10:33 ` Peter Zijlstra
2018-07-19 11:01 ` Thomas Gleixner
2018-07-19 15:58 ` Pavel Tatashin
2018-07-19 16:19 ` Thomas Gleixner
2018-07-19 16:49 ` Pavel Tatashin
2018-07-19 18:38 ` Pavel Tatashin
2018-07-19 20:44 ` Thomas Gleixner
2018-07-19 20:46 ` Pavel Tatashin
2018-07-23 9:28 ` Alan Cox
2018-07-18 2:22 ` [PATCH v14 21/25] x86/tsc: initialize cyc2ns when tsc freq. is determined Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 22/25] x86/tsc: use tsc early Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 23/25] sched: move sched clock initialization and merge with generic clock Pavel Tatashin
2018-07-18 2:22 ` [PATCH v14 24/25] sched: early boot clock Pavel Tatashin
2018-07-19 10:39 ` Peter Zijlstra
2018-07-19 14:16 ` Pavel Tatashin [this message]
2018-07-18 2:22 ` [PATCH v14 25/25] sched: use static key for sched_clock_running Pavel Tatashin
2018-07-19 10:48 ` Peter Zijlstra
2018-07-19 14:24 ` Pavel Tatashin
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