Date: Mon, 13 Jul 2015 22:52:12 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r285511 - head/sys/kern Message-ID: <201507132252.t6DMqCPx032271@repo.freebsd.org>
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Author: mjg Date: Mon Jul 13 22:52:11 2015 New Revision: 285511 URL: https://svnweb.freebsd.org/changeset/base/285511 Log: racct: perform a lockless check for p_throttled This reduces proc lock contention. Reviewed by: trasz Modified: head/sys/kern/subr_trap.c Modified: head/sys/kern/subr_trap.c ============================================================================== --- head/sys/kern/subr_trap.c Mon Jul 13 21:01:24 2015 (r285510) +++ head/sys/kern/subr_trap.c Mon Jul 13 22:52:11 2015 (r285511) @@ -172,7 +172,7 @@ userret(struct thread *td, struct trapfr (td->td_vnet_lpush != NULL) ? td->td_vnet_lpush : "N/A")); #endif #ifdef RACCT - if (racct_enable) { + if (racct_enable && p->p_throttled == 1) { PROC_LOCK(p); while (p->p_throttled == 1) msleep(p->p_racct, &p->p_mtx, 0, "racct", 0);
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