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qemu-log: Avoid function call for disabled qemu_log_mask logging

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Make qemu_log_mask() a macro which only calls the function to
do the actual work if the logging is enabled. This avoids making
a function call in possible fast paths where logging is disabled.

Backports commit 7ee606230e6b7645d92365d9b39179368e83ac54 from qemu
This commit is contained in:
Peter Maydell 2018-02-22 09:32:40 -05:00 committed by Lioncash
parent bc5d7c5e1d
commit 66e1bacd64
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 10 additions and 15 deletions
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13
qemu/include/qemu/log.h
View file

@ -62,10 +62,17 @@ qemu_log_vprintf(const char *fmt, va_list va)
}
}
/* log only if a bit is set on the current loglevel mask
/* log only if a bit is set on the current loglevel mask:
* @mask: bit to check in the mask
* @fmt: printf-style format string
* @args: optional arguments for format string
*/
void GCC_FMT_ATTR(2, 3) qemu_log_mask(int mask, const char *fmt, ...);
#define qemu_log_mask(MASK, FMT, ...) \
do { \
if (unlikely(qemu_loglevel_mask(MASK))) { \
qemu_log(FMT, ## __VA_ARGS__); \
} \
} while (0)
/* Special cases: */

12
qemu/qemu-log.c
View file

@ -34,15 +34,3 @@ void qemu_log(const char *fmt, ...)
}
va_end(ap);
}
void qemu_log_mask(int mask, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if ((qemu_loglevel & mask) && qemu_logfile) {
vfprintf(qemu_logfile, fmt, ap);
}
va_end(ap);
}