From: Paul Mackerras <paulus@samba.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Mike Galbraith <efault@gmx.de>,
Arjan van de Ven <arjan@infradead.org>,
Wu Fengguang <fengguang.wu@intel.com>,
Eric Dumazet <dada1@cosmosbay.com>
Subject: Re: [PATCH 1/9] perf_counter: unify and fix delayed counter wakeup
Date: Sun, 29 Mar 2009 21:02:17 +1100 [thread overview]
Message-ID: <18895.18217.393755.824092@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <1238318710.23852.38.camel@twins>
Peter Zijlstra writes:
> In a perfect world, I'd introduce a self-ipi on UP and use that. Also,
> in that same perfect world, all arches would support cmpxchg()/xchg() so
> we could put the whole thing in generic code.
We already require atomic64_t, which not all architectures have - in
particular, ppc32 doesn't have it, though it does have cmpxchg/xchg
for 32-bit quantities. The list of architectures that have atomic64_t
seems to be a proper subset of the list of architectures that have
cmpxchg, from a quick grep. So I would think you can use cmpxchg if
necessary.
Paul.
next prev parent reply other threads:[~2009-03-29 10:19 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-28 19:43 [PATCH 0/9] perf_counter patches Peter Zijlstra
2009-03-28 19:44 ` [PATCH 1/9] perf_counter: unify and fix delayed counter wakeup Peter Zijlstra
2009-03-29 0:14 ` Paul Mackerras
2009-03-29 9:16 ` Peter Zijlstra
2009-03-29 9:25 ` Peter Zijlstra
2009-03-29 10:02 ` Paul Mackerras [this message]
2009-03-28 19:44 ` [PATCH 2/9] perf_counter: fix update_userpage() Peter Zijlstra
2009-03-29 0:24 ` Paul Mackerras
2009-04-02 8:50 ` Peter Zijlstra
2009-04-02 9:00 ` Peter Zijlstra
2009-04-02 9:21 ` Paul Mackerras
2009-04-02 9:28 ` Peter Zijlstra
2009-04-02 9:15 ` Paul Mackerras
2009-04-02 9:36 ` Peter Zijlstra
2009-04-02 9:58 ` Paul Mackerras
2009-04-02 10:36 ` Peter Zijlstra
2009-03-28 19:44 ` [PATCH 3/9] perf_counter: kerneltop: simplify data_head read Peter Zijlstra
2009-03-28 19:44 ` [PATCH 4/9] perf_counter: executable mmap() information Peter Zijlstra
2009-03-28 19:44 ` [PATCH 5/9] perf_counter: kerneltop: parse the mmap data stream Peter Zijlstra
2009-03-28 19:44 ` [PATCH 6/9] perf_counter: powerpc: only reserve PMU hardware when we need it Peter Zijlstra
2009-03-28 19:44 ` [PATCH 7/9] perf_counter: make it possible for hw_perf_counter_init to return error codes Peter Zijlstra
2009-03-30 4:13 ` Paul Mackerras
2009-03-28 19:44 ` [PATCH 8/9] perf_counter tools: optionally scale counter values in perfstat mode Peter Zijlstra
2009-03-28 19:44 ` [PATCH 9/9] RFC perf_counter: event overlow handling Peter Zijlstra
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