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authorPaul Mundt <lethal@linux-sh.org>2010-10-13 03:46:25 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-10-27 16:51:33 +0900
commit2e4f17d230d84579fef07836fb5f69bf1a0a47ad (patch)
tree552b861fccfd34c7664f097293ce10014cf6134d /arch/sh/oprofile/common.c
parent667b279baa529a1b5bd120d4ce3df643a5749263 (diff)
downloadop-kernel-dev-2e4f17d230d84579fef07836fb5f69bf1a0a47ad.zip
op-kernel-dev-2e4f17d230d84579fef07836fb5f69bf1a0a47ad.tar.gz
sh: oprofile: Fix up and extend op_name_from_perf_id().
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>
Diffstat (limited to 'arch/sh/oprofile/common.c')
-rw-r--r--arch/sh/oprofile/common.c31
1 files changed, 17 insertions, 14 deletions
diff --git a/arch/sh/oprofile/common.c b/arch/sh/oprofile/common.c
index e10d893..8453314 100644
--- a/arch/sh/oprofile/common.c
+++ b/arch/sh/oprofile/common.c
@@ -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)
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