From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: benh@kernel.crashing.org
Cc: Daniel Jacobowitz <drow@false.org>,
gdb@sourceware.org, linuxppc-embedded@ozlabs.org,
Matt Mackall <mpm@selenic.com>
Subject: Re: Apparent kernel bug with GDB on ppc405
Date: Fri, 26 Oct 2007 20:41:00 -0000 [thread overview]
Message-ID: <20071026154126.28082129@weaponx.rchland.ibm.com> (raw)
In-Reply-To: <1193363482.7018.41.camel@pasglop>
On Fri, 26 Oct 2007 11:51:22 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
>
> On Wed, 2007-10-24 at 18:41 -0400, Daniel Jacobowitz wrote:
> > On Wed, Oct 24, 2007 at 05:32:50PM -0500, Matt Mackall wrote:
> > > Not completely implausible, but a) why isn't this seen on basically
> > > every machine with software TLB? b) why does -local- GDB, which is
> > > presumably doing much less work than gdbserver + network stack, not fail?
> >
> > You said it yourself. Local gdb does more work -> blows through more
> > TLB entries.
> >
> > I can't answer you about the other half, but I'm pretty sure TLB
> > invalidation is already supposed to be happening... somewhere.
>
> Yes. do_wp_page() -> ptep_clear_flush() -> flush_tlb_page()
Aren't there cases in do_wp_page that don't call ptep_clear_flush?
Seems anonymous pages, and possibly shared writeable pages skip that
step if reuse is true.
josh
next prev parent reply other threads:[~2007-10-26 20:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-24 19:46 Matt Mackall
2007-10-24 20:28 ` Grant Likely
2007-10-24 20:42 ` Matt Mackall
2007-10-24 20:46 ` Grant Likely
2007-10-24 21:54 ` Matt Mackall
2007-10-24 22:28 ` Grant Likely
2007-10-24 22:33 ` Matt Mackall
2007-10-24 22:39 ` Grant Likely
2007-10-24 22:40 ` Grant Likely
2007-10-26 1:51 ` Benjamin Herrenschmidt
2007-10-24 22:41 ` Daniel Jacobowitz
2007-10-26 1:51 ` Benjamin Herrenschmidt
2007-10-26 20:41 ` Josh Boyer [this message]
2007-10-27 1:36 ` Benjamin Herrenschmidt
2007-10-27 1:40 ` Josh Boyer
2007-10-24 20:34 ` David Daney
2007-10-26 1:52 ` Benjamin Herrenschmidt
2007-10-26 1:47 ` Benjamin Herrenschmidt
2007-10-26 2:45 ` Grant Likely
2007-10-26 3:23 ` Benjamin Herrenschmidt
2007-10-26 14:42 ` Matt Mackall
2007-10-27 1:31 ` Benjamin Herrenschmidt
[not found] ` <1193470322.18243.63.camel@pasglop>
[not found] ` <20071029070824.72854629@weaponx.rchland.ibm.com>
[not found] ` <20071029151546.5af0e843@weaponx.rchland.ibm.com>
[not found] ` <1193690106.9928.32.camel@pasglop>
2007-10-29 21:19 ` [PATCH/RFC] powerpc: Pass PID argument to _tlbie (WAS: Apparent kernel bug with GDB on ppc405) Matt Mackall
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=20071026154126.28082129@weaponx.rchland.ibm.com \
--to=jwboyer@linux.vnet.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=drow@false.org \
--cc=gdb@sourceware.org \
--cc=linuxppc-embedded@ozlabs.org \
--cc=mpm@selenic.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).