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perf core: Pass max stack as a perf_callchain_entry context

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This makes perf_callchain_{user,kernel}() receive the max stack
as context for the perf_callchain_entry, instead of accessing
the global sysctl_perf_event_max_stack.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/n/tip-kolmn1yo40p7jhswxwrc7rrd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-04-28 12:30:53 -03:00
parent a831100aee
commit cfbcf46845
15 changed files with 84 additions and 73 deletions
Download patch file Download diff file Expand all files Collapse all files

12
arch/mips/kernel/perf_event.c
View file

@ -25,8 +25,8 @@
* the user stack callchains, we will add it here.
*/
static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
unsigned long reg29)
static void save_raw_perf_callchain(struct perf_callchain_entry_ctx *entry,
unsigned long reg29)
{
unsigned long *sp = (unsigned long *)reg29;
unsigned long addr;
@ -35,14 +35,14 @@ static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
addr = *sp++;
if (__kernel_text_address(addr)) {
perf_callchain_store(entry, addr);
if (entry->nr >= sysctl_perf_event_max_stack)
if (entry->entry->nr >= entry->max_stack)
break;
}
}
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
struct pt_regs *regs)
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
@ -59,7 +59,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
}
do {
perf_callchain_store(entry, pc);
if (entry->nr >= sysctl_perf_event_max_stack)
if (entry->entry->nr >= entry->max_stack)
break;
pc = unwind_stack(current, &sp, pc, &ra);
} while (pc);