From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E . McKenney" <paulmck@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Michal Hocko <mhocko@suse.com>,
rostedt@goodmis.org, jbaron@akamai.com, ardb@kernel.org
Subject: Re: [RFC PATCH 6/8] preempt/dynamic: Provide preempt_schedule[_notrace]() static calls
Date: Wed, 3 Feb 2021 15:04:23 +0100 [thread overview]
Message-ID: <YBqtZwIbj6kQEiEd@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210127231837.ifddpn7rhwdaepiu@treble>
On Wed, Jan 27, 2021 at 05:18:37PM -0600, Josh Poimboeuf wrote:
> On Wed, Jan 27, 2021 at 01:02:18PM -0600, Josh Poimboeuf wrote:
> > On Wed, Jan 27, 2021 at 01:00:07PM -0600, Josh Poimboeuf wrote:
> > > On Wed, Jan 27, 2021 at 07:44:01PM +0100, Peter Zijlstra wrote:
> > > > On Wed, Jan 27, 2021 at 10:33:08AM -0600, Josh Poimboeuf wrote:
> > > >
> > > > > What did you think about .static_call_tramp_key? I could whip up a
> > > > > patch later unless you beat me to it.
> > > >
> > > > Yeah, I'm not sure.. why duplicate information already present in
> > > > kallsyms?
> > >
> > > Well, but it's not exactly duplicating kallsyms. No need to store
> > > symbol names, just the pointer relationships. And kallsyms is
> > > presumably slow.
> > >
> > > > There's a fair number of features that already require KALLSYMS, I can't
> > > > really be bothered about adding one more (kprobes, function_tracer,
> > > > stack_tracer, ftrace_syscalls).
>
> Here ya go. It builds... And the tramp_key section is nice and small.
>
> Relocation section [1497] '.rela.static_call_tramp_key' for section [1496] '.static_call_tramp_key' at offset 0x179ab818 contains 8 entries:
> Offset Type Value Addend Name
> 000000000000000000 X86_64_PC32 0x00000000000004c0 +0 __SCT__preempt_schedule
> 0x0000000000000004 X86_64_PC32 0x000000000005ee10 +0 __SCK__preempt_schedule
> 0x0000000000000008 X86_64_PC32 0x00000000000004c8 +0 __SCT__preempt_schedule_notrace
> 0x000000000000000c X86_64_PC32 0x000000000005ee00 +0 __SCK__preempt_schedule_notrace
> 0x0000000000000010 X86_64_PC32 0x00000000000004d0 +0 __SCT__cond_resched
> 0x0000000000000014 X86_64_PC32 0x000000000005dd20 +0 __SCK__cond_resched
> 0x0000000000000018 X86_64_PC32 0x00000000000004d8 +0 __SCT__might_resched
> 0x000000000000001c X86_64_PC32 0x000000000005dd10 +0 __SCK__might_resched
>
Fair enough I suppose. I'll slap a changelog and your SoB on it and I
suppose I'll got commit the whole lot. Then we can forget about it
again.
next prev parent reply other threads:[~2021-02-03 14:06 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 14:12 [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v4 Frederic Weisbecker
2021-01-18 14:12 ` [RFC PATCH 1/8] static_call/x86: Add __static_call_return0() Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-18 14:12 ` [RFC PATCH 2/8] static_call: Provide DEFINE_STATIC_CALL_RET0() Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2021-02-17 13:17 ` tip-bot2 for Frederic Weisbecker
2021-01-18 14:12 ` [RFC PATCH 3/8] static_call: Pull some static_call declarations to the type headers Frederic Weisbecker
2021-01-19 10:46 ` Jürgen Groß
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-18 14:12 ` [RFC PATCH 4/8] preempt: Introduce CONFIG_PREEMPT_DYNAMIC Frederic Weisbecker
2021-01-22 16:53 ` Peter Zijlstra
2021-01-28 12:17 ` Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Michal Hocko
2021-02-17 13:17 ` tip-bot2 for Michal Hocko
2021-01-18 14:12 ` [RFC PATCH 5/8] preempt/dynamic: Provide cond_resched() and might_resched() static calls Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 6/8] preempt/dynamic: Provide preempt_schedule[_notrace]() " Frederic Weisbecker
2021-01-21 21:58 ` Peter Zijlstra
2021-01-21 22:25 ` Peter Zijlstra
2021-01-22 16:52 ` Peter Zijlstra
2021-01-22 16:57 ` Ard Biesheuvel
2021-01-22 17:08 ` Peter Zijlstra
2021-02-08 12:00 ` [tip: sched/core] sched: Add /debug/sched_preempt tip-bot2 for Peter Zijlstra
2021-02-09 15:45 ` tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-25 23:40 ` [RFC PATCH 6/8] preempt/dynamic: Provide preempt_schedule[_notrace]() static calls Josh Poimboeuf
2021-01-26 9:24 ` Peter Zijlstra
2021-01-26 23:57 ` Josh Poimboeuf
2021-01-27 9:13 ` Peter Zijlstra
2021-01-27 11:27 ` Peter Zijlstra
2021-01-27 15:59 ` Josh Poimboeuf
2021-01-27 16:19 ` Peter Zijlstra
2021-01-27 16:33 ` Josh Poimboeuf
2021-01-27 18:44 ` Peter Zijlstra
2021-01-27 19:00 ` Josh Poimboeuf
2021-01-27 19:02 ` Josh Poimboeuf
2021-01-27 23:18 ` Josh Poimboeuf
2021-02-03 14:04 ` Peter Zijlstra [this message]
2021-02-05 15:30 ` Peter Zijlstra
2021-02-06 2:31 ` Josh Poimboeuf
2021-02-06 9:03 ` Peter Zijlstra
2021-02-05 15:22 ` Peter Zijlstra
2021-02-08 12:00 ` [tip: sched/core] static_call: Allow module use without exposing static_call_key tip-bot2 for Josh Poimboeuf
2021-02-09 15:45 ` tip-bot2 for Josh Poimboeuf
2021-02-17 13:17 ` tip-bot2 for Josh Poimboeuf
2021-02-08 12:00 ` [tip: sched/core] preempt/dynamic: Provide preempt_schedule[_notrace]() static calls tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 7/8] preempt/dynamic: Provide irqentry_exit_cond_resched() static call Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 8/8] preempt/dynamic: Support dynamic preempt with preempt= boot option Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-09 15:45 ` tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-21 21:22 ` [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v4 Peter Zijlstra
2021-01-22 15:02 ` Paul E. McKenney
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