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[src/trunk]: src clock_gettime(2): Fix CLOCK_PROCESS/THREAD_CPUTIME_ID.
details: https://anonhg.NetBSD.org/src/rev/a431fe694534
branches: trunk
changeset: 377361:a431fe694534
user: riastradh <riastradh%NetBSD.org@localhost>
date: Sat Jul 08 20:02:10 2023 +0000
description:
clock_gettime(2): Fix CLOCK_PROCESS/THREAD_CPUTIME_ID.
Use same calculation as getrusage, not some ad-hoc arithmetic of
internal scheduler parameters that are periodically rewound.
PR kern/57512
XXX pullup-8
XXX pullup-9
XXX pullup-10
diffstat:
sys/kern/kern_resource.c | 47 +++++++++++++++++++--------------
sys/kern/subr_time.c | 50 ++++++++++-------------------------
sys/sys/resourcevar.h | 5 ++-
tests/lib/libc/sys/t_clock_gettime.c | 6 +--
4 files changed, 47 insertions(+), 61 deletions(-)
diffs (241 lines):
diff -r d05f5e62ced4 -r a431fe694534 sys/kern/kern_resource.c
--- a/sys/kern/kern_resource.c Sat Jul 08 19:10:00 2023 +0000
+++ b/sys/kern/kern_resource.c Sat Jul 08 20:02:10 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_resource.c,v 1.190 2023/07/08 11:42:03 riastradh Exp $ */
+/* $NetBSD: kern_resource.c,v 1.191 2023/07/08 20:02:10 riastradh Exp $ */
/*-
* Copyright (c) 1982, 1986, 1991, 1993
@@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_resource.c,v 1.190 2023/07/08 11:42:03 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_resource.c,v 1.191 2023/07/08 20:02:10 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -478,6 +478,30 @@ sys_getrlimit(struct lwp *l, const struc
return copyout(&rl, SCARG(uap, rlp), sizeof(rl));
}
+void
+addrulwp(struct lwp *l, struct bintime *tm)
+{
+
+ lwp_lock(l);
+ bintime_add(tm, &l->l_rtime);
+ if ((l->l_pflag & LP_RUNNING) != 0 &&
+ (l->l_pflag & (LP_INTR | LP_TIMEINTR)) != LP_INTR) {
+ struct bintime diff;
+ /*
+ * Adjust for the current time slice. This is
+ * actually fairly important since the error
+ * here is on the order of a time quantum,
+ * which is much greater than the sampling
+ * error.
+ */
+ binuptime(&diff);
+ membar_consumer(); /* for softint_dispatch() */
+ bintime_sub(&diff, &l->l_stime);
+ bintime_add(tm, &diff);
+ }
+ lwp_unlock(l);
+}
+
/*
* Transform the running time and tick information in proc p into user,
* system, and interrupt time usage.
@@ -504,24 +528,7 @@ calcru(struct proc *p, struct timeval *u
tm = p->p_rtime;
LIST_FOREACH(l, &p->p_lwps, l_sibling) {
- lwp_lock(l);
- bintime_add(&tm, &l->l_rtime);
- if ((l->l_pflag & LP_RUNNING) != 0 &&
- (l->l_pflag & (LP_INTR | LP_TIMEINTR)) != LP_INTR) {
- struct bintime diff;
- /*
- * Adjust for the current time slice. This is
- * actually fairly important since the error
- * here is on the order of a time quantum,
- * which is much greater than the sampling
- * error.
- */
- binuptime(&diff);
- membar_consumer(); /* for softint_dispatch() */
- bintime_sub(&diff, &l->l_stime);
- bintime_add(&tm, &diff);
- }
- lwp_unlock(l);
+ addrulwp(l, &tm);
}
tot = st + ut + it;
diff -r d05f5e62ced4 -r a431fe694534 sys/kern/subr_time.c
--- a/sys/kern/subr_time.c Sat Jul 08 19:10:00 2023 +0000
+++ b/sys/kern/subr_time.c Sat Jul 08 20:02:10 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_time.c,v 1.37 2023/04/29 03:36:55 isaki Exp $ */
+/* $NetBSD: subr_time.c,v 1.38 2023/07/08 20:02:10 riastradh Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
@@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_time.c,v 1.37 2023/04/29 03:36:55 isaki Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_time.c,v 1.38 2023/07/08 20:02:10 riastradh Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@@ -45,12 +45,6 @@
#include <sys/timetc.h>
#include <sys/intr.h>
-#ifdef DEBUG_STICKS
-#define DPRINTF(a) uprintf a
-#else
-#define DPRINTF(a)
-#endif
-
/*
* Compute number of hz until specified time. Used to compute second
* argument to callout_reset() from an absolute time.
@@ -248,32 +242,16 @@ clock_timeleft(clockid_t clockid, struct
*sleepts = sleptts;
}
-static void
-ticks2ts(uint64_t ticks, struct timespec *ts)
-{
- ts->tv_sec = ticks / hz;
- uint64_t sticks = ticks - ts->tv_sec * hz;
- if (sticks > BINTIME_SCALE_MS) /* floor(2^64 / 1000) */
- ts->tv_nsec = sticks / hz * 1000000000LL;
- else if (sticks > BINTIME_SCALE_US) /* floor(2^64 / 1000000) */
- ts->tv_nsec = sticks * 1000LL / hz * 1000000LL;
- else
- ts->tv_nsec = sticks * 1000000000LL / hz;
- DPRINTF(("%s: %ju/%ju -> %ju.%ju\n", __func__,
- (uintmax_t)ticks, (uintmax_t)sticks,
- (uintmax_t)ts->tv_sec, (uintmax_t)ts->tv_nsec));
-}
-
int
clock_gettime1(clockid_t clock_id, struct timespec *ts)
{
int error;
- uint64_t ticks;
struct proc *p;
#define CPUCLOCK_ID_MASK (~(CLOCK_THREAD_CPUTIME_ID|CLOCK_PROCESS_CPUTIME_ID))
if (clock_id & CLOCK_PROCESS_CPUTIME_ID) {
pid_t pid = clock_id & CPUCLOCK_ID_MASK;
+ struct timeval cputime;
mutex_enter(&proc_lock);
p = pid == 0 ? curproc : proc_find(pid);
@@ -281,10 +259,10 @@ clock_gettime1(clockid_t clock_id, struc
mutex_exit(&proc_lock);
return ESRCH;
}
- ticks = p->p_uticks + p->p_sticks + p->p_iticks;
- DPRINTF(("%s: u=%ju, s=%ju, i=%ju\n", __func__,
- (uintmax_t)p->p_uticks, (uintmax_t)p->p_sticks,
- (uintmax_t)p->p_iticks));
+ mutex_enter(p->p_lock);
+ calcru(p, /*usertime*/NULL, /*systime*/NULL, /*intrtime*/NULL,
+ &cputime);
+ mutex_exit(p->p_lock);
mutex_exit(&proc_lock);
// XXX: Perhaps create a special kauth type
@@ -293,9 +271,14 @@ clock_gettime1(clockid_t clock_id, struc
KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL);
if (error)
return error;
+
+ TIMEVAL_TO_TIMESPEC(&cputime, ts);
+ return 0;
} else if (clock_id & CLOCK_THREAD_CPUTIME_ID) {
struct lwp *l;
lwpid_t lid = clock_id & CPUCLOCK_ID_MASK;
+ struct bintime tm = {0, 0};
+
p = curproc;
mutex_enter(p->p_lock);
l = lid == 0 ? curlwp : lwp_find(p, lid);
@@ -303,15 +286,10 @@ clock_gettime1(clockid_t clock_id, struc
mutex_exit(p->p_lock);
return ESRCH;
}
- ticks = l->l_rticksum + l->l_slpticksum;
- DPRINTF(("%s: r=%ju, s=%ju\n", __func__,
- (uintmax_t)l->l_rticksum, (uintmax_t)l->l_slpticksum));
+ addrulwp(l, &tm);
mutex_exit(p->p_lock);
- } else
- ticks = (uint64_t)-1;
- if (ticks != (uint64_t)-1) {
- ticks2ts(ticks, ts);
+ bintime2timespec(&tm, ts);
return 0;
}
diff -r d05f5e62ced4 -r a431fe694534 sys/sys/resourcevar.h
--- a/sys/sys/resourcevar.h Sat Jul 08 19:10:00 2023 +0000
+++ b/sys/sys/resourcevar.h Sat Jul 08 20:02:10 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: resourcevar.h,v 1.57 2018/05/07 21:03:45 christos Exp $ */
+/* $NetBSD: resourcevar.h,v 1.58 2023/07/08 20:02:10 riastradh Exp $ */
/*
* Copyright (c) 1991, 1993
@@ -41,6 +41,8 @@
#include <sys/mutex.h>
#include <sys/resource.h>
+struct bintime;
+
/*
* Kernel per-process accounting / statistics
*/
@@ -107,6 +109,7 @@ void addupc_intr(struct lwp *, u_long);
void addupc_task(struct lwp *, u_long, u_int);
void calcru(struct proc *, struct timeval *, struct timeval *,
struct timeval *, struct timeval *);
+void addrulwp(struct lwp *, struct bintime *);
struct plimit *lim_copy(struct plimit *);
void lim_addref(struct plimit *);
diff -r d05f5e62ced4 -r a431fe694534 tests/lib/libc/sys/t_clock_gettime.c
--- a/tests/lib/libc/sys/t_clock_gettime.c Sat Jul 08 19:10:00 2023 +0000
+++ b/tests/lib/libc/sys/t_clock_gettime.c Sat Jul 08 20:02:10 2023 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: t_clock_gettime.c,v 1.4 2023/07/08 14:05:51 riastradh Exp $ */
+/* $NetBSD: t_clock_gettime.c,v 1.5 2023/07/08 20:02:10 riastradh Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -58,7 +58,7 @@
#include <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2008\
The NetBSD Foundation, inc. All rights reserved.");
-__RCSID("$NetBSD: t_clock_gettime.c,v 1.4 2023/07/08 14:05:51 riastradh Exp $");
+__RCSID("$NetBSD: t_clock_gettime.c,v 1.5 2023/07/08 20:02:10 riastradh Exp $");
#include <sys/param.h>
@@ -281,8 +281,6 @@ ATF_TC_HEAD(clock_gettime_thread_cputime
}
ATF_TC_BODY(clock_gettime_thread_cputime_is_monotonic, tc)
{
- atf_tc_expect_fail("PR kern/57512: clock_gettime"
- "(CLOCK_THREAD_CPUTIME_ID) sometimes goes backwards");
check_monotonicity("CLOCK_THREAD_CPUTIME_ID",
CLOCK_THREAD_CPUTIME_ID, &waste_user_time);
}
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