Date: Mon, 24 Jan 2011 22:58:00 GMT From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 188139 for review Message-ID: <201101242258.p0OMw0un087914@skunkworks.freebsd.org>
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http://p4web.freebsd.org/@@188139?ac=10 Change 188139 by trasz@trasz_victim on 2011/01/24 22:56:59 Rounding of %CPU is bad, especially for a very shortly living processes. Implement a workaround. Affected files ... .. //depot/projects/soc2009/trasz_limits/TODO#41 edit .. //depot/projects/soc2009/trasz_limits/sys/kern/kern_container.c#64 edit .. //depot/projects/soc2009/trasz_limits/sys/kern/kern_rctl.c#16 edit .. //depot/projects/soc2009/trasz_limits/sys/sys/container.h#23 edit Differences ... ==== //depot/projects/soc2009/trasz_limits/TODO#41 (text+ko) ==== @@ -20,6 +20,9 @@ Also, try to figure out what's going on with 'intr' p_flag - checking for P_SYSTEM didn't really work for that process. + - The jailstat(1)/userstat(1) tool seems to use lots of CPU time. Rewriting + it in C could make sense. + Issues: - Setting RSS limit too low can make the system thrash to death. ==== //depot/projects/soc2009/trasz_limits/sys/kern/kern_container.c#64 (text+ko) ==== @@ -86,6 +86,19 @@ SDT_PROBE_DEFINE2(container, kernel, container, join_failure, join-failure, "struct container *", "struct container *"); SDT_PROBE_DEFINE2(container, kernel, container, leave, leave, "struct container *", "struct container *"); +int +container_resource_in_thousands(int resource) +{ + switch (resource) { + case RUSAGE_CPU: + case RUSAGE_WALLCLOCK: + case RUSAGE_PCTCPU: + return (1); + default: + return (0); + } +} + static int container_resource_reclaimable(int resource) { @@ -658,7 +671,7 @@ if (runtime < p->p_prev_runtime) runtime = p->p_prev_runtime; #endif - pctcpu = (runtime - p->p_prev_runtime) / 10000; + pctcpu = (runtime - p->p_prev_runtime) / 10; rusage_set(p, RUSAGE_CPU, runtime); rusage_add(p, RUSAGE_PCTCPU, pctcpu); @@ -811,7 +824,7 @@ if (runtime < p->p_prev_runtime) runtime = p->p_prev_runtime; #endif - pctcpu = (runtime - p->p_prev_runtime) / 10000; + pctcpu = (runtime - p->p_prev_runtime) / 10; p->p_prev_runtime = runtime; if (pctcpu > pctcpu_limit) rusage_throttle(p, 1); ==== //depot/projects/soc2009/trasz_limits/sys/kern/kern_rctl.c#16 (text+ko) ==== @@ -867,6 +867,8 @@ error = str2int64(amountstr, &rule->rr_amount); if (error != 0) goto out; + if (container_resource_in_thousands(rule->rr_resource)) + rule->rr_amount *= 1000; } if (perstr == NULL || perstr[0] == '\0') @@ -1048,6 +1050,7 @@ static void rctl_rule_to_sbuf(struct sbuf *sb, const struct rctl_rule *rule) { + int64_t amount; sbuf_printf(sb, "%s:", rctl_subject_type_name(rule->rr_subject_type)); @@ -1081,10 +1084,15 @@ rule->rr_subject_type); } + amount = rule->rr_amount; + if (amount != RCTL_AMOUNT_UNDEFINED && + container_resource_in_thousands(rule->rr_resource)) + amount /= 1000; + sbuf_printf(sb, "%s:%s=%jd", rctl_resource_name(rule->rr_resource), rctl_action_name(rule->rr_action), - rule->rr_amount); + amount); if (rule->rr_per != rule->rr_subject_type) sbuf_printf(sb, "/%s", rctl_subject_type_name(rule->rr_per)); @@ -1140,12 +1148,15 @@ rctl_container_to_sbuf(struct container *container) { int i; + int64_t amount; struct sbuf *sb; sb = sbuf_new_auto(); for (i = 0; i <= RUSAGE_MAX; i++) { - sbuf_printf(sb, "%s=%jd,", rctl_resource_name(i), - container->c_resources[i]); + amount = container->c_resources[i]; + if (container_resource_in_thousands(i)) + amount /= 1000; + sbuf_printf(sb, "%s=%jd,", rctl_resource_name(i), amount); } sbuf_setpos(sb, sbuf_len(sb) - 1); return (sb); ==== //depot/projects/soc2009/trasz_limits/sys/sys/container.h#23 (text+ko) ==== @@ -113,4 +113,6 @@ void container_proc_ucred_changed(struct proc *p, struct ucred *oldcred, struct ucred *newcred); +int container_resource_in_thousands(int resource); + #endif /* !_CONTAINER_H_ */
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