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author | Frederic Weisbecker <fweisbec@gmail.com> | 2010-06-30 23:03:51 +0200 |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-08-19 01:30:59 +0200 |
commit | 56962b4449af34070bb1994621ef4f0265eed4d8 (patch) | |
tree | b4c5dfee35d272c71cba80e75a51cb3e7070e430 /arch/sh | |
parent | 70791ce9ba68a5921c9905ef05d23f62a90bc10c (diff) | |
download | linux-3.10-56962b4449af34070bb1994621ef4f0265eed4d8.tar.gz linux-3.10-56962b4449af34070bb1994621ef4f0265eed4d8.tar.bz2 linux-3.10-56962b4449af34070bb1994621ef4f0265eed4d8.zip |
perf: Generalize some arch callchain code
- Most archs use one callchain buffer per cpu, except x86 that needs
to deal with NMIs. Provide a default perf_callchain_buffer()
implementation that x86 overrides.
- Centralize all the kernel/user regs handling and invoke new arch
handlers from there: perf_callchain_user() / perf_callchain_kernel()
That avoid all the user_mode(), current->mm checks and so...
- Invert some parameters in perf_callchain_*() helpers: entry to the
left, regs to the right, following the traditional (dst, src).
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: David Miller <davem@davemloft.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Borislav Petkov <bp@amd64.org>
Diffstat (limited to 'arch/sh')
-rw-r--r-- | arch/sh/kernel/perf_callchain.c | 37 |
1 files changed, 2 insertions, 35 deletions
diff --git a/arch/sh/kernel/perf_callchain.c b/arch/sh/kernel/perf_callchain.c index 00143f3dd19..ef076a91292 100644 --- a/arch/sh/kernel/perf_callchain.c +++ b/arch/sh/kernel/perf_callchain.c @@ -44,44 +44,11 @@ static const struct stacktrace_ops callchain_ops = { .address = callchain_address, }; -static void -perf_callchain_kernel(struct pt_regs *regs, struct perf_callchain_entry *entry) +void +perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs) { perf_callchain_store(entry, PERF_CONTEXT_KERNEL); perf_callchain_store(entry, regs->pc); unwind_stack(NULL, regs, NULL, &callchain_ops, entry); } - -static void -perf_do_callchain(struct pt_regs *regs, struct perf_callchain_entry *entry) -{ - int is_user; - - if (!regs) - return; - - is_user = user_mode(regs); - - /* - * Only the kernel side is implemented for now. - */ - if (!is_user) - perf_callchain_kernel(regs, entry); -} - -/* - * No need for separate IRQ and NMI entries. - */ -static DEFINE_PER_CPU(struct perf_callchain_entry, callchain); - -struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) -{ - struct perf_callchain_entry *entry = &__get_cpu_var(callchain); - - entry->nr = 0; - - perf_do_callchain(regs, entry); - - return entry; -} |