All of lore.kernel.org
 help / color / mirror / Atom feed
From: Rik van Riel <riel@surriel.com>
To: Dave Hansen <dave.hansen@intel.com>,
	Ingo Molnar <mingo@kernel.org>, Ira Weiny <ira.weiny@intel.com>,
	Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [RFC PATCH 5/5] x86/entry: Store CPU info on exception entry
Date: Mon, 08 Aug 2022 13:24:43 -0400	[thread overview]
Message-ID: <06dc568d91979a3816af602a00884560cb5ec026.camel@surriel.com> (raw)
In-Reply-To: <01768c70-a012-0d08-cfa5-a7a87ff0a19c@intel.com>

[-- Attachment #1: Type: text/plain, Size: 765 bytes --]

On Mon, 2022-08-08 at 09:16 -0700, Dave Hansen wrote:
> On 8/8/22 04:03, Ingo Molnar wrote:
> > > Again, I don't believe this is too much overhead but I don't want
> > > people 
> > > to say it was not discussed.
> > Is it necessary to do this, what are the alternatives, can this
> > overhead be 
> > avoided?
> 
> I'm thinking that the whole racy smp_processor_id() thing wasn't so
> bad
> in the first place.
> 

FWIW, just grabbing the CPU number in show_signal_msg()
appears to be good enough for our use. 

It will typically show >90% of the errors happening on the
CPU core that went bad, which is more than enough to diagnose 
that a server has a hardware issue and should probably have
the CPU repaired.

-- 
All Rights Reversed.

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

  reply	other threads:[~2022-08-08 17:25 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-05 17:30 [RFC PATCH 0/5] Print CPU at segfault time ira.weiny
2022-08-05 17:30 ` [RFC PATCH 1/5] entry: Pass pt_regs to irqentry_exit_cond_resched() ira.weiny
2022-08-05 18:33   ` Rik van Riel
2022-08-08 10:38   ` Borislav Petkov
2022-08-08 17:34     ` Ira Weiny
2022-08-08 17:38       ` Borislav Petkov
2022-08-08 17:43         ` Dave Hansen
2022-08-08 17:52           ` Borislav Petkov
2022-08-09 23:18     ` Thomas Gleixner
2022-08-10  7:25       ` Thomas Gleixner
2022-08-05 17:30 ` [RFC PATCH 2/5] entry: Add calls for save/restore auxiliary pt_regs ira.weiny
2022-08-05 18:34   ` Rik van Riel
2022-08-09 12:05   ` Borislav Petkov
2022-08-09 18:38     ` Ira Weiny
2022-08-09 18:49       ` Borislav Petkov
2022-08-09 21:14         ` Thomas Gleixner
2022-08-09 21:38           ` Borislav Petkov
2022-08-09 22:33             ` Ira Weiny
2022-08-09 21:49         ` Ira Weiny
2022-08-09 23:53           ` Thomas Gleixner
2022-08-05 17:30 ` [RFC PATCH 3/5] x86/entry: Add auxiliary pt_regs space ira.weiny
2022-08-05 18:45   ` Rik van Riel
2022-08-05 17:30 ` [RFC PATCH 4/5] x86,mm: print likely CPU at segfault time ira.weiny
2022-08-05 17:30 ` [RFC PATCH 5/5] x86/entry: Store CPU info on exception entry ira.weiny
2022-08-05 18:46   ` Rik van Riel
2022-08-05 18:47   ` Dave Hansen
2022-08-06  9:01     ` Ingo Molnar
2022-08-06  9:11       ` Borislav Petkov
2022-08-07 10:02         ` Ingo Molnar
2022-08-07 10:35           ` Borislav Petkov
2022-08-07 20:02             ` Ira Weiny
2022-08-08 11:03               ` Ingo Molnar
2022-08-08 12:01                 ` Borislav Petkov
2022-08-09 20:06                   ` Thomas Gleixner
2022-08-08 16:16                 ` Dave Hansen
2022-08-08 17:24                   ` Rik van Riel [this message]
2022-08-09 21:19                   ` Andy Lutomirski

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=06dc568d91979a3816af602a00884560cb5ec026.camel@surriel.com \
    --to=riel@surriel.com \
    --cc=bp@alien8.de \
    --cc=dave.hansen@intel.com \
    --cc=ira.weiny@intel.com \
    --cc=kernel-team@fb.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=mingo@kernel.org \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.