Date: Sat, 2 Apr 2016 09:11:52 +0000 (UTC) From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r297510 - head/sys/kern Message-ID: <201604020911.u329BqYB021014@repo.freebsd.org>
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Author: trasz Date: Sat Apr 2 09:11:52 2016 New Revision: 297510 URL: https://svnweb.freebsd.org/changeset/base/297510 Log: Add configurable rate limit for "log" and "devctl" actions. MFC after: 1 month Sponsored by: The FreeBSD Foundation Modified: head/sys/kern/kern_rctl.c Modified: head/sys/kern/kern_rctl.c ============================================================================== --- head/sys/kern/kern_rctl.c Sat Apr 2 08:36:24 2016 (r297509) +++ head/sys/kern/kern_rctl.c Sat Apr 2 09:11:52 2016 (r297510) @@ -78,10 +78,16 @@ FEATURE(rctl, "Resource Limits"); #define RCTL_PCPU_SHIFT (10 * 1000000) unsigned int rctl_maxbufsize = RCTL_MAX_OUTBUFSIZE; +static int rctl_log_rate_limit = 10; +static int rctl_devctl_rate_limit = 10; SYSCTL_NODE(_kern_racct, OID_AUTO, rctl, CTLFLAG_RW, 0, "Resource Limits"); SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, maxbufsize, CTLFLAG_RWTUN, &rctl_maxbufsize, 0, "Maximum output buffer size"); +SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, log_rate_limit, CTLFLAG_RW, + &rctl_log_rate_limit, 0, "Maximum number of log messages per second"); +SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, devctl_rate_limit, CTLFLAG_RW, + &rctl_devctl_rate_limit, 0, "Maximum number of devctl messages per second"); /* * 'rctl_rule_link' connects a rule with every racct it's related to. @@ -336,13 +342,13 @@ rctl_pcpu_available(const struct proc *p int rctl_enforce(struct proc *p, int resource, uint64_t amount) { + static struct timeval log_lasttime, devctl_lasttime; + static int log_curtime = 0, devctl_curtime = 0; struct rctl_rule *rule; struct rctl_rule_link *link; struct sbuf sb; int should_deny = 0; char *buf; - static int curtime = 0; - static struct timeval lasttime; ASSERT_RACCT_ENABLED(); @@ -383,7 +389,8 @@ rctl_enforce(struct proc *p, int resourc if (p->p_state != PRS_NORMAL) continue; - if (!ppsratecheck(&lasttime, &curtime, 10)) + if (!ppsratecheck(&log_lasttime, &log_curtime, + rctl_log_rate_limit)) continue; buf = malloc(RCTL_LOG_BUFSIZE, M_RCTL, M_NOWAIT); @@ -409,6 +416,10 @@ rctl_enforce(struct proc *p, int resourc if (p->p_state != PRS_NORMAL) continue; + if (!ppsratecheck(&devctl_lasttime, &devctl_curtime, + rctl_devctl_rate_limit)) + continue; + buf = malloc(RCTL_LOG_BUFSIZE, M_RCTL, M_NOWAIT); if (buf == NULL) { printf("rctl_enforce: out of memory\n");
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