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Time accounting must be done by coarse timers

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on some ARM, the precise timers are too slow to be actually useful
This commit is contained in:
Maria Matejka 2024-06-10 23:09:05 +02:00
parent 4d01ca3e8f
commit 5c8179d63a
3 changed files with 43 additions and 2 deletions
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25
aclocal.m4 vendored
View File

@ -120,6 +120,31 @@ AC_DEFUN([BIRD_CHECK_MPLS_KERNEL],
) )
]) ])
AC_DEFUN([BIRD_CHECK_CLOCK],
[
AC_CACHE_CHECK(
[for $1],
[bird_cv_clock_$1],
[
AC_COMPILE_IFELSE(
[
AC_LANG_PROGRAM(
[
#include <time.h>
],
[
struct timespec tv;
clock_gettime($1, &tv);
]
)
],
[bird_cv_clock_$1=yes],
[bird_cv_clock_$1=no]
)
]
)
])
AC_DEFUN([BIRD_CHECK_ANDROID_GLOB], AC_DEFUN([BIRD_CHECK_ANDROID_GLOB],
[ [
AC_CACHE_CHECK( AC_CACHE_CHECK(

12
configure.ac
View File

@ -308,6 +308,18 @@ if test "$enable_mpls_kernel" != no ; then
fi fi
fi fi
BIRD_CHECK_CLOCK(CLOCK_MONOTONIC)
if test "$bird_cv_clock_CLOCK_MONOTONIC" != yes ; then
AC_MSG_ERROR([Monotonic clock not supported])
fi
BIRD_CHECK_CLOCK(CLOCK_MONOTONIC_COARSE)
if test "$bird_cv_clock_CLOCK_MONOTONIC_COARSE" != yes ; then
AC_DEFINE([HAVE_CLOCK_MONOTONIC_COARSE], [0], [Define to 1 if coarse clock is available])
else
AC_DEFINE([HAVE_CLOCK_MONOTONIC_COARSE], [1], [Define to 1 if coarse clock is available])
fi
# temporarily removed "mrt" from all_protocols to speed up 3.0-alpha1 release # temporarily removed "mrt" from all_protocols to speed up 3.0-alpha1 release
all_protocols="aggregator bfd babel bgp l3vpn ospf pipe radv rip rpki static" all_protocols="aggregator bfd babel bgp l3vpn ospf pipe radv rip rpki static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'` all_protocols=`echo $all_protocols | sed 's/ /,/g'`

8
sysdep/unix/io-loop.c
View File

@ -42,11 +42,15 @@ static struct birdloop *birdloop_new_no_pickup(pool *pp, uint order, const char
* BIRD for such a long time, please implement some means of overflow prevention. * BIRD for such a long time, please implement some means of overflow prevention.
*/ */
#if ! HAVE_CLOCK_MONOTONIC_COARSE
#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
#endif
static struct timespec ns_begin; static struct timespec ns_begin;
static void ns_init(void) static void ns_init(void)
{ {
if (clock_gettime(CLOCK_MONOTONIC, &ns_begin)) if (clock_gettime(CLOCK_MONOTONIC_COARSE, &ns_begin))
bug("clock_gettime: %m"); bug("clock_gettime: %m");
} }
@ -55,7 +59,7 @@ static void ns_init(void)
u64 ns_now(void) u64 ns_now(void)
{ {
struct timespec ts; struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts)) if (clock_gettime(CLOCK_MONOTONIC_COARSE, &ts))
bug("clock_gettime: %m"); bug("clock_gettime: %m");
return (u64) (ts.tv_sec - ns_begin.tv_sec) * NSEC_IN_SEC + ts.tv_nsec - ns_begin.tv_nsec; return (u64) (ts.tv_sec - ns_begin.tv_sec) * NSEC_IN_SEC + ts.tv_nsec - ns_begin.tv_nsec;