From: Stephane Eranian <eranian@hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] Re: [BUG] perfmon doesn't send SIGPROF in kernel 2.5.64
Date: Fri, 18 Apr 2003 14:38:16 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590723705562@msgid-missing> (raw)
Eric,
On Fri, Apr 18, 2003 at 02:00:19PM +0200, Eric Piel wrote:
> Stephane Eranian wrote:
> >
> > The attached patch against 2.5.67 corrects the problem. Note that this
> > patch also includes other updates.
> >
> > Let me know how it goes.
> Very good, it worked!:
I glad to see that it worked for you as well this time.
>
> Also, after a quick glance at the patch I noticed this update:
> -/* pmc8 */ { PFM_REG_CONFIG , 0, 0xffffffff3fffffffUL,
> 0xffffffff9fffffffUL, NULL, pfm_mck_pmc_check, {0UL,0UL, 0UL, 0UL},
> {0UL,0UL, 0UL, 0UL}},
> -/* pmc9 */ { PFM_REG_CONFIG , 0, 0xffffffff3ffffffcUL,
> 0xffffffff9fffffffUL, NULL, pfm_mck_pmc_check, {0UL,0UL, 0UL, 0UL},
> {0UL,0UL, 0UL, 0UL}},
> +/* pmc8 */ { PFM_REG_CONFIG , 0, 0xffffffff3fffffffUL,
> 0xffffffff3fffffffUL, NULL, pfm_mck_pmc_check, {0UL,0UL, 0UL, 0UL},
> {0UL,0UL, 0UL, 0UL}},
> +/* pmc9 */ { PFM_REG_CONFIG , 0, 0xffffffff3ffffffcUL,
> 0xffffffff3fffffffUL, NULL, pfm_mck_pmc_check, {0UL,0UL, 0UL, 0UL},
> {0UL,0UL, 0UL, 0UL}},
>
> Could you describe shortly what this is suppose to fix? Recently I had
> some troubles with some PMU counters on Itanium2 (hard to trigger) and I
> wonder if this could be solved by that patch...
>
This only affects measurements made with the opcode matchers. The UIUC
folks reported a problem with certain opcode pattern not being counted
properly. I was off by one bit in the mask. This has no affect on
measurements NOT using the opcode matchers.
--
-Stephane
reply other threads:[~2003-04-18 14:38 UTC|newest]
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