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Message-ID: <1429773908.32612.32.camel@perches.com>
Date: Thu, 23 Apr 2015 00:25:08 -0700
From: Joe Perches <joe@...ches.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mark Fasheh <mfasheh@...e.com>, Joel Becker <jlbec@...lplan.org>,
ocfs2-devel@....oracle.com, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH V2 -next] ocfs2: Reduce object size of mlog uses
Using a function for __mlog_printk instead of a macro
reduces the object size of built-in.o by about 190KB, or
~18% overall (x86-64 defconfig with all ocfs2 options)
$ size fs/ocfs2/built-in.o*
text data bss dec hex filename
870954 118471 134408 1123833 1125f9 fs/ocfs2/built-in.o,new
1064081 118071 134408 1316560 1416d0 fs/ocfs2/built-in.o.old
Miscellanea:
o Move the used-once __mlog_cpu_guess statement expression macro
to the masklog.c file above the use in __mlog_printk function
o Simplify the mlog macro moving the and/or logic and level code
into __mlog_printk
Signed-off-by: Joe Perches <joe@...ches.com>
---
V2: Moving and/or logic to the __mlog_printk function reduces
the object size an additional ~65K
fs/ocfs2/cluster/masklog.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/cluster/masklog.h | 42 ++++++++++++------------------------------
2 files changed, 58 insertions(+), 30 deletions(-)
diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
index af7598b..fc5e522 100644
--- a/fs/ocfs2/cluster/masklog.c
+++ b/fs/ocfs2/cluster/masklog.c
@@ -64,6 +64,52 @@ static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
return count;
}
+/*
+ * smp_processor_id() "helpfully" screams when called outside preemptible
+ * regions in current kernels. sles doesn't have the variants that don't
+ * scream. just do this instead of trying to guess which we're building
+ * against.. *sigh*.
+ */
+#define __mlog_cpu_guess \
+({ \
+ unsigned long _cpu = get_cpu(); \
+ put_cpu(); \
+ _cpu; \
+})
+
+void __mlog_printk(const u64 *mask, const char *func, int line,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+ const char *level;
+ const char *prefix = "";
+
+ if (!__mlog_test_u64(*mask, mlog_and_bits) ||
+ __mlog_test_u64(*mask, mlog_not_bits))
+ return;
+
+ if (*mask & ML_ERROR) {
+ level = KERN_ERR;
+ prefix = "ERROR: ";
+ } else if (*mask & ML_NOTICE) {
+ level = KERN_NOTICE;
+ } else {
+ level = KERN_INFO;
+ }
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk("%s(%s,%u,%lu):%s:%d %s%pV",
+ level, current->comm, task_pid_nr(current), __mlog_cpu_guess,
+ func, line, prefix, &vaf);
+
+ va_end(args);
+}
+
struct mlog_attribute {
struct attribute attr;
u64 mask;
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index 7fdc25a..308ea0e 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -162,38 +162,20 @@ extern struct mlog_bits mlog_and_bits, mlog_not_bits;
#endif
-/*
- * smp_processor_id() "helpfully" screams when called outside preemptible
- * regions in current kernels. sles doesn't have the variants that don't
- * scream. just do this instead of trying to guess which we're building
- * against.. *sigh*.
- */
-#define __mlog_cpu_guess ({ \
- unsigned long _cpu = get_cpu(); \
- put_cpu(); \
- _cpu; \
-})
+__printf(4, 5)
+void __mlog_printk(const u64 *m, const char *func, int line,
+ const char *fmt, ...);
-/* In the following two macros, the whitespace after the ',' just
- * before ##args is intentional. Otherwise, gcc 2.95 will eat the
- * previous token if args expands to nothing.
+/*
+ * Testing before the __mlog_printk call lets the compiler eliminate the
+ * call completely when (m & ML_ALLOWED_BITS) is 0.
*/
-#define __mlog_printk(level, fmt, args...) \
- printk(level "(%s,%u,%lu):%s:%d " fmt, current->comm, \
- task_pid_nr(current), __mlog_cpu_guess, \
- __PRETTY_FUNCTION__, __LINE__ , ##args)
-
-#define mlog(mask, fmt, args...) do { \
- u64 __m = MLOG_MASK_PREFIX | (mask); \
- if ((__m & ML_ALLOWED_BITS) && \
- __mlog_test_u64(__m, mlog_and_bits) && \
- !__mlog_test_u64(__m, mlog_not_bits)) { \
- if (__m & ML_ERROR) \
- __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
- else if (__m & ML_NOTICE) \
- __mlog_printk(KERN_NOTICE, fmt , ##args); \
- else __mlog_printk(KERN_INFO, fmt , ##args); \
- } \
+#define mlog(mask, fmt, ...) \
+do { \
+ u64 _m = MLOG_MASK_PREFIX | (mask); \
+ if (_m & ML_ALLOWED_BITS) \
+ __mlog_printk(&_m, __func__, __LINE__, fmt, \
+ ##__VA_ARGS__); \
} while (0)
#define mlog_errno(st) ({ \
--
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