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perf: Generalize some arch callchain code

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- 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>
This commit is contained in:
Frederic Weisbecker
2010-06-30 23:03:51 +02:00
parent 70791ce9ba
commit 56962b4449
7 changed files with 90 additions and 180 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
arch/sh/kernel/perf_callchain.c
View File

@@ -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;
}