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sh: oprofile: Fix up and extend op_name_from_perf_id().

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op_name_from_perf_id() currently returns a local variable, which isn't
terribly productive. As we only handle a single PMU case for now, simply
allocate and free the string from the arch init/exit context and have
op_name_from_perf_id() hand back the cached string.

This also takes UTS_MACHINE in to account, given that we build for
multiple architectures.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-10-13 03:46:25 +09:00
parent 667b279baa
commit 2e4f17d230
4 changed files with 21 additions and 16 deletions
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2
arch/sh/kernel/cpu/sh4/perf_event.c
View File

@ -225,7 +225,7 @@ static void sh7750_pmu_enable_all(void)
}
static struct sh_pmu sh7750_pmu = {
.name = "SH7750",
.name = "sh7750",
.num_events = 2,
.event_map = sh7750_event_map,
.max_events = ARRAY_SIZE(sh7750_general_events),

2
arch/sh/kernel/cpu/sh4a/perf_event.c
View File

@ -259,7 +259,7 @@ static void sh4a_pmu_enable_all(void)
}
static struct sh_pmu sh4a_pmu = {
.name = "SH-4A",
.name = "sh4a",
.num_events = 2,
.event_map = sh4a_event_map,
.max_events = ARRAY_SIZE(sh4a_general_events),

2
arch/sh/oprofile/Makefile
View File

@ -1,5 +1,7 @@
obj-$(CONFIG_OPROFILE) += oprofile.o
CFLAGS_common.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
oprof.o cpu_buffer.o buffer_sync.o \
event_buffer.o oprofile_files.o \

31
arch/sh/oprofile/common.c
View File

@ -1,7 +1,7 @@
/*
* arch/sh/oprofile/init.c
*
* Copyright (C) 2003 - 2008 Paul Mundt
* Copyright (C) 2003 - 2010 Paul Mundt
*
* Based on arch/mips/oprofile/common.c:
*
@ -18,38 +18,41 @@
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/perf_event.h>
#include <linux/slab.h>
#include <asm/processor.h>
#ifdef CONFIG_HW_PERF_EVENTS
extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
/*
* This will need to be reworked when multiple PMUs are supported.
*/
static char *sh_pmu_op_name;
char *op_name_from_perf_id(void)
{
const char *pmu;
char buf[20];
int size;
pmu = perf_pmu_name();
if (!pmu)
return NULL;
size = snprintf(buf, sizeof(buf), "sh/%s", pmu);
if (size > -1 && size < sizeof(buf))
return buf;
return NULL;
return sh_pmu_op_name;
}
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
ops->backtrace = sh_backtrace;
if (perf_num_counters() == 0)
return -ENODEV;
sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s",
UTS_MACHINE, perf_pmu_name());
if (unlikely(!sh_pmu_op_name))
return -ENOMEM;
return oprofile_perf_init(ops);
}
void __exit oprofile_arch_exit(void)
{
oprofile_perf_exit();
kfree(sh_pmu_op_name);
}
#else
int __init oprofile_arch_init(struct oprofile_operations *ops)