From: Peter Zijlstra <peterz@infradead.org>
To: Valentin Schneider <vschneid@redhat.com>
Cc: "Petr Tesarik" <ptesarik@suse.com>,
"Dave Hansen" <dave.hansen@intel.com>,
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Subject: Re: [RFC PATCH v3 13/15] context_tracking,x86: Add infrastructure to defer kernel TLBI
Date: Mon, 9 Dec 2024 13:12:49 +0100 [thread overview]
Message-ID: <20241209121249.GN35539@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <xhsmh1pyh6p0k.mognet@vschneid-thinkpadt14sgen2i.remote.csb>
On Mon, Dec 09, 2024 at 01:04:43PM +0100, Valentin Schneider wrote:
> > But I wonder what exactly was the original scenario encountered by
> > Valentin. I mean, if TLB entry invalidations were necessary to sync
> > changes to kernel text after flipping a static branch, then it might be
> > less overhead to make a list of affected pages and call INVLPG on them.
No; TLB is not involved with text patching (on x86).
> > Valentin, do you happen to know?
>
> So from my experimentation (hackbench + kernel compilation on housekeeping
> CPUs, dummy while(1) userspace loop on isolated CPUs), the TLB flushes only
> occurred from vunmap() - mainly from all the hackbench threads coming and
> going.
Right, we have virtually mapped stacks.
next prev parent reply other threads:[~2024-12-09 12:12 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-19 15:34 [RFC PATCH v3 00/15] context_tracking,x86: Defer some IPIs until a user->kernel transition Valentin Schneider
2024-11-19 15:34 ` [RFC PATCH v3 01/15] objtool: Make validate_call() recognize indirect calls to pv_ops[] Valentin Schneider
2024-11-19 20:38 ` Josh Poimboeuf
2024-11-19 15:34 ` [RFC PATCH v3 02/15] objtool: Flesh out warning related to pv_ops[] calls Valentin Schneider
2024-11-19 20:38 ` Josh Poimboeuf
2024-11-19 15:34 ` [RFC PATCH v3 03/15] sched/clock: Make sched_clock_running __ro_after_init Valentin Schneider
2024-11-19 15:34 ` [RFC PATCH v3 04/15] rcu: Add a small-width RCU watching counter debug option Valentin Schneider
2024-11-20 14:50 ` Peter Zijlstra
2024-11-20 16:15 ` Valentin Schneider
2024-11-22 12:53 ` Paul E. McKenney
2024-11-22 13:56 ` Valentin Schneider
2024-11-19 15:34 ` [RFC PATCH v3 05/15] rcutorture: Make TREE04 use CONFIG_RCU_DYNTICKS_TORTURE Valentin Schneider
2024-11-22 12:54 ` Paul E. McKenney
2024-11-19 15:34 ` [RFC PATCH v3 06/15] jump_label: Add forceful jump label type Valentin Schneider
2024-11-19 23:39 ` Josh Poimboeuf
2024-11-20 14:56 ` Peter Zijlstra
2024-11-20 14:57 ` Peter Zijlstra
2024-11-20 16:55 ` Josh Poimboeuf
2024-11-21 11:00 ` Peter Zijlstra
2024-11-21 15:38 ` Josh Poimboeuf
2024-11-21 15:51 ` Valentin Schneider
2024-11-21 20:21 ` Josh Poimboeuf
2024-11-22 10:17 ` Valentin Schneider
2024-11-20 16:24 ` Valentin Schneider
2024-11-20 0:05 ` Josh Poimboeuf
2024-11-20 10:22 ` Peter Zijlstra
2024-11-19 15:34 ` [RFC PATCH v3 07/15] x86/speculation/mds: Make mds_idle_clear forceful Valentin Schneider
2024-11-19 15:34 ` [RFC PATCH v3 08/15] sched/clock, x86: Make __sched_clock_stable forceful Valentin Schneider
2024-11-20 14:59 ` Peter Zijlstra
2024-11-20 16:34 ` Valentin Schneider
2024-11-21 11:02 ` Peter Zijlstra
2024-11-19 15:34 ` [RFC PATCH v3 09/15] objtool: Warn about non __ro_after_init static key usage in .noinstr Valentin Schneider
2024-11-20 17:13 ` Josh Poimboeuf
2024-11-19 15:34 ` [RFC PATCH v3 10/15] x86/alternatives: Record text_poke's of JUMP_TYPE_FORCEFUL labels Valentin Schneider
2024-11-19 15:34 ` [RFC PATCH v3 11/15] context-tracking: Introduce work deferral infrastructure Valentin Schneider
2024-11-20 10:54 ` Frederic Weisbecker
2024-11-20 14:23 ` Frederic Weisbecker
2024-11-20 17:10 ` Valentin Schneider
2024-11-20 17:30 ` Frederic Weisbecker
2024-11-22 14:56 ` Valentin Schneider
2024-11-24 21:46 ` Frederic Weisbecker
2024-11-29 16:40 ` Valentin Schneider
2024-11-29 22:19 ` Frederic Weisbecker
2024-11-19 15:34 ` [RFC PATCH v3 12/15] context_tracking,x86: Defer kernel text patching IPIs Valentin Schneider
2024-11-20 15:13 ` Peter Zijlstra
2024-11-19 15:35 ` [RFC PATCH v3 13/15] context_tracking,x86: Add infrastructure to defer kernel TLBI Valentin Schneider
2024-11-20 15:22 ` Peter Zijlstra
2024-11-20 15:32 ` Peter Zijlstra
2024-11-20 17:24 ` Valentin Schneider
2024-11-21 11:12 ` Peter Zijlstra
2024-11-21 15:07 ` Dave Hansen
2024-11-21 15:30 ` Peter Zijlstra
2024-12-05 17:31 ` Petr Tesarik
2024-12-09 12:04 ` Valentin Schneider
2024-12-09 12:12 ` Peter Zijlstra [this message]
2024-12-09 14:42 ` Petr Tesarik
2024-12-10 13:53 ` Valentin Schneider
2024-12-10 14:42 ` Petr Tesarik
2024-12-09 12:33 ` Petr Tesarik
2024-11-21 16:26 ` Peter Zijlstra
2024-11-19 15:35 ` [RFC PATCH v3 14/15] x86/mm, mm/vmalloc: Defer flush_tlb_kernel_range() targeting NOHZ_FULL CPUs Valentin Schneider
2024-11-19 15:35 ` [RFC PATCH v3 15/15] context-tracking: Add a Kconfig to enable IPI deferral for NO_HZ_IDLE Valentin Schneider
2024-11-19 16:45 ` [RFC PATCH v3 00/15] context_tracking,x86: Defer some IPIs until a user->kernel transition Steven Rostedt
2024-11-19 22:51 ` Valentin Schneider
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