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From: Joerg Roedel <jroedel@suse.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Borislav Petkov <bp@alien8.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Shile Zhang <shile.zhang@linux.alibaba.com>,
	Andy Lutomirski <luto@amacapital.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Tzvetomir Stoyanov <tz.stoyanov@gmail.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: [RFC][PATCH] x86/mm: Sync all vmalloc mappings before text_poke()
Date: Wed, 29 Apr 2020 16:10:04 +0200	[thread overview]
Message-ID: <20200429141004.GR30814@suse.de> (raw)
In-Reply-To: <20200429100731.201312a9@gandalf.local.home>

On Wed, Apr 29, 2020 at 10:07:31AM -0400, Steven Rostedt wrote:
> Talking with Mathieu about this on IRC, he pointed out that my code does
> have a vzalloc() that is called:
> 
> in trace_pid_write()
> 
> 	pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3);
> 
> This is done when -P1,2 is on the trace-cmd command line.

Yeah, I was guessing something like this, init_mm has a mapping which
poking_mm has not. I currently try to reproduce this on one of my
machines.

Regards,

	Joerg

  reply	other threads:[~2020-04-29 14:10 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-29  9:48 [RFC][PATCH] x86/mm: Sync all vmalloc mappings before text_poke() Steven Rostedt
2020-04-29 10:59 ` Joerg Roedel
2020-04-29 12:28   ` Steven Rostedt
2020-04-29 14:07     ` Steven Rostedt
2020-04-29 14:10       ` Joerg Roedel [this message]
2020-04-29 14:32         ` Steven Rostedt
2020-04-29 15:44           ` Peter Zijlstra
2020-04-29 16:17       ` Joerg Roedel
2020-04-29 16:20         ` Joerg Roedel
2020-04-29 16:52           ` Steven Rostedt
2020-04-29 17:29             ` Mathieu Desnoyers
2020-04-29 18:51               ` Peter Zijlstra
2020-04-30 14:11       ` Joerg Roedel
2020-04-30 14:50         ` Joerg Roedel
2020-04-30 15:20           ` Mathieu Desnoyers
2020-04-30 16:16             ` Steven Rostedt
2020-04-30 16:18               ` Mathieu Desnoyers
2020-04-30 16:30                 ` Steven Rostedt
2020-04-30 16:35                   ` Mathieu Desnoyers
2020-04-30 15:23         ` Mathieu Desnoyers
2020-04-30 16:12           ` Steven Rostedt
2020-04-30 16:11         ` Steven Rostedt
2020-04-30 16:16           ` Mathieu Desnoyers
2020-04-30 16:25             ` Steven Rostedt
2020-04-30 19:14           ` Joerg Roedel
2020-05-01  1:13             ` Steven Rostedt
2020-05-01  2:26               ` Mathieu Desnoyers
2020-05-01  2:39                 ` Steven Rostedt
2020-05-01 10:16                   ` Joerg Roedel
2020-05-01 13:35                   ` Mathieu Desnoyers
2020-05-04 15:12                   ` [PATCH] percpu: Sync vmalloc mappings in pcpu_alloc() and free_percpu() Joerg Roedel
2020-05-04 15:28                     ` Mathieu Desnoyers
2020-05-04 15:31                       ` Joerg Roedel
2020-05-04 15:38                         ` Mathieu Desnoyers
2020-05-04 15:51                           ` Joerg Roedel
2020-05-04 17:04                           ` Steven Rostedt
2020-05-04 17:40                     ` Steven Rostedt
2020-05-04 18:38                       ` Joerg Roedel
2020-05-04 19:10                         ` Steven Rostedt
2020-05-05 12:31                           ` [PATCH] tracing: Call vmalloc_sync_mappings() after alloc_percpu() Joerg Roedel
2020-05-06 15:17                             ` Steven Rostedt
2020-05-08 14:42                               ` Joerg Roedel
2020-05-04 20:25                     ` [PATCH] percpu: Sync vmalloc mappings in pcpu_alloc() and free_percpu() Peter Zijlstra
2020-05-04 20:43                       ` Steven Rostedt
2020-05-01  4:20                 ` [RFC][PATCH] x86/mm: Sync all vmalloc mappings before text_poke() Steven Rostedt
2020-05-01 13:22                   ` Mathieu Desnoyers

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