From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 2/3 v3] powerpc: Allow perf_counters to access user memory at interrupt time
Date: Tue, 18 Aug 2009 14:24:40 +1000 [thread overview]
Message-ID: <1250569480.19007.22.camel@pasglop> (raw)
In-Reply-To: <19081.57621.37210.987830@cargo.ozlabs.ibm.com>
On Tue, 2009-08-18 at 09:00 +1000, Paul Mackerras wrote:
> This provides a mechanism to allow the perf_counters code to access
> user memory in a PMU interrupt routine. Such an access can cause
> various kinds of interrupt: SLB miss, MMU hash table miss, segment
> table miss, or TLB miss, depending on the processor. This commit
> only deals with 64-bit classic/server processors, which use an MMU
> hash table. 32-bit processors are already able to access user memory
> at interrupt time. Since we don't soft-disable on 32-bit, we avoid
> the possibility of reentering hash_page or the TLB miss handlers,
> since they run with interrupts disabled.
.../...
>
> Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
next prev parent reply other threads:[~2009-08-18 4:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 23:00 [PATCH 1/3 v3] powerpc/32: Always order writes to halves of 64-bit PTEs Paul Mackerras
2009-08-17 23:00 ` [PATCH 2/3 v3] powerpc: Allow perf_counters to access user memory at interrupt time Paul Mackerras
2009-08-18 4:24 ` Benjamin Herrenschmidt [this message]
2009-08-17 23:01 ` [PATCH 3/3 v3] perf_counter: powerpc: Add callchain support Paul Mackerras
2009-08-18 4:23 ` Benjamin Herrenschmidt
2009-08-18 0:00 ` [PATCH 1/3 v3] powerpc/32: Always order writes to halves of 64-bit PTEs Kumar Gala
2009-08-18 0:14 ` Paul Mackerras
2009-08-18 4:24 ` Benjamin Herrenschmidt
2009-08-19 23:16 ` NAND ECC Error with wrong SMC ording bug Feng Kan
2009-08-20 4:38 ` Sean MacLennan
2009-08-20 5:01 ` [U-Boot] " Stefan Roese
2009-08-20 19:36 ` Sean MacLennan
2009-08-20 22:56 ` Victor Gallardo
2009-08-21 5:17 ` vimal singh
2009-08-21 6:26 ` Sean MacLennan
2009-08-21 6:27 ` Stefan Roese
2009-08-21 6:30 ` Victor Gallardo
2009-08-20 23:42 ` Feng Kan
2009-08-21 7:59 ` Stefan Roese
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