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Date: Thu, 27 Mar 2008 21:25:11 +0100
From: Roel Kluin <12o3l@...cali.nl>
To: Daniel Walker <dwalker@...sta.com>,
Andrew Morton <akpm@...ux-foundation.org>
CC: nickpiggin@...oo.com.au, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 -mm] likeliness accounting change and cleanup
Daniel Walker wrote:
> It's looks good to me .. You'll have to send it to Andrew to get it
> included tho ..
>
> Daniel
Store __builtin_return_address (caller) rather than __func__ in likeliness
struct. 'line' and 'type' are combined in 'label'
+/- now denotes whether expectation fails in less than 5% of the tests - rather
than whether more unexpected than expected were encountered. The function at
the displayed filename & line and the caller are not necessarily the same.
A few more Likely Profiling Results changes were made.
struct seq_operations becomes static, unsigned ints true and false (shadowed)
are replaced by pos and neg.
Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
This should be applied after the -mm patches:
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc5/2.6.25-rc5-mm1/broken-out/profile-likely-unlikely-macros.patch
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc5/2.6.25-rc5-mm1/broken-out/profile-likely-unlikely-macros-fix.patch
New layout:
Likely Profiling Results
--------------------------------------------------------------------
[+- ]Type | # True | # False | Function@...ename:Line
unlikely | 0| 32082| fget+0xd0/0x1d0@...lude/asm/arch/atomic_32.h:235
Compiles and runs here. Thanks for previous comments.
include/linux/compiler.h | 16 ++++++++--------
lib/likely_prof.c | 45 +++++++++++++++++++++++++--------------------
2 files changed, 33 insertions(+), 28 deletions(-)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index d6d9efc..bd31d4c 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -53,25 +53,25 @@ extern void __chk_io_ptr(const volatile void __iomem *);
#if defined(CONFIG_PROFILE_LIKELY) && !(defined(CONFIG_MODULE_UNLOAD) && defined(MODULE))
struct likeliness {
- const char *func;
- char *file;
- int line;
- int type;
+ char *const file;
+ unsigned long caller;
unsigned int count[2];
struct likeliness *next;
+ unsigned int label;
};
-extern int do_check_likely(struct likeliness *likeliness, int exp);
+extern int do_check_likely(struct likeliness *likeliness, unsigned int exp);
+#define LP_IS_EXPECTED 1
#define LP_UNSEEN 4
+#define LP_LINE_SHIFT 3
#define __check_likely(exp, is_likely) \
({ \
static struct likeliness likeliness = { \
- .func = __func__, \
.file = __FILE__, \
- .line = __LINE__, \
- .type = is_likely | LP_UNSEEN, \
+ .label = __LINE__ << LP_LINE_SHIFT | \
+ LP_UNSEEN | is_likely, \
}; \
do_check_likely(&likeliness, !!(exp)); \
})
diff --git a/lib/likely_prof.c b/lib/likely_prof.c
index 5c6d91d..c9f5de3 100644
--- a/lib/likely_prof.c
+++ b/lib/likely_prof.c
@@ -15,34 +15,34 @@
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
+#include <linux/kallsyms.h>
#include <asm/bug.h>
#include <asm/atomic.h>
static struct likeliness *likeliness_head;
-int do_check_likely(struct likeliness *likeliness, int ret)
+int do_check_likely(struct likeliness *likeliness, unsigned int ret)
{
static unsigned long likely_lock;
- if (ret)
- likeliness->count[1]++;
- else
- likeliness->count[0]++;
+ likeliness->count[ret]++;
- if (likeliness->type & LP_UNSEEN) {
+ if (likeliness->label & LP_UNSEEN) {
/*
- * We don't simple use a spinlock because internally to the
+ * We don't simply use a spinlock because internally to the
* spinlock there is a call to unlikely which causes recursion.
* We opted for this method because we didn't need a preempt/irq
* disable and it was a bit cleaner then using internal __raw
* spinlock calls.
*/
if (!test_and_set_bit(0, &likely_lock)) {
- if (likeliness->type & LP_UNSEEN) {
- likeliness->type &= (~LP_UNSEEN);
+ if (likeliness->label & LP_UNSEEN) {
+ likeliness->label &= (~LP_UNSEEN);
likeliness->next = likeliness_head;
likeliness_head = likeliness;
+ likeliness->caller = (unsigned long)
+ __builtin_return_address(0);
}
smp_mb__before_clear_bit();
clear_bit(0, &likely_lock);
@@ -61,8 +61,8 @@ static void * lp_seq_start(struct seq_file *out, loff_t *pos)
seq_printf(out, "Likely Profiling Results\n");
seq_printf(out, " --------------------------------------------"
"------------------------\n");
- seq_printf(out, "[+- ] Type | # True | # False | Function:"
- "Filename@...e\n");
+ seq_printf(out, "[+- ]Type | # True | # False | Function@"
+ "Filename:Line\n");
out->private = likeliness_head;
}
@@ -86,18 +86,22 @@ static void *lp_seq_next(struct seq_file *out, void *p, loff_t *pos)
static int lp_seq_show(struct seq_file *out, void *p)
{
struct likeliness *entry = p;
- unsigned int true = entry->count[1];
- unsigned int false = entry->count[0];
-
- if (!entry->type) {
- if (true > false)
+ unsigned int pos = entry->count[1];
+ unsigned int neg = entry->count[0];
+ char function[KSYM_SYMBOL_LEN];
+
+ /*
+ * Balanced if the suggestion was false in less than 5% of the tests
+ */
+ if (!(entry->label & LP_IS_EXPECTED)) {
+ if (pos + neg < 20 * pos)
seq_printf(out, "+");
else
seq_printf(out, " ");
seq_printf(out, "unlikely ");
} else {
- if (true < false)
+ if (pos + neg < 20 * neg)
seq_printf(out, "-");
else
seq_printf(out, " ");
@@ -105,8 +109,9 @@ static int lp_seq_show(struct seq_file *out, void *p)
seq_printf(out, "likely ");
}
- seq_printf(out, "|%9u|%9u\t%s()@:%s@%d\n", true, false,
- entry->func, entry->file, entry->line);
+ sprint_symbol(function, entry->caller);
+ seq_printf(out, "|%9u|%9u|\t%s@%s:%u\n", pos, neg, function,
+ entry->file, entry->label >> LP_LINE_SHIFT);
return 0;
}
@@ -115,7 +120,7 @@ static void lp_seq_stop(struct seq_file *m, void *p)
{
}
-struct seq_operations likely_profiling_ops = {
+static struct seq_operations likely_profiling_ops = {
.start = lp_seq_start,
.next = lp_seq_next,
.stop = lp_seq_stop,
--
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