Date: Fri, 20 Apr 2012 21:40:32 +0000 (UTC) From: Davide Italiano <davide@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r234505 - in stable/9/sys: conf kern Message-ID: <201204202140.q3KLeWpm056649@svn.freebsd.org>
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Author: davide Date: Fri Apr 20 21:40:31 2012 New Revision: 234505 URL: http://svn.freebsd.org/changeset/base/234505 Log: MFC: r233045, r234302 r233045: Add rudimentary profiling of the hash table used in the umtx code to hold active lock queues. r234302: Fix some style bugs introduced in a previous commit (r233045) Approved by: gnn (mentor) Modified: stable/9/sys/conf/NOTES stable/9/sys/conf/options stable/9/sys/kern/kern_umtx.c Directory Properties: stable/9/sys/ (props changed) stable/9/sys/conf/ (props changed) Modified: stable/9/sys/conf/NOTES ============================================================================== --- stable/9/sys/conf/NOTES Fri Apr 20 21:37:42 2012 (r234504) +++ stable/9/sys/conf/NOTES Fri Apr 20 21:40:31 2012 (r234505) @@ -275,6 +275,8 @@ options SX_NOINLINE # frequency. # TURNSTILE_PROFILING enables rudimentary profiling of the hash table # used to hold active lock queues. +# UMTX_PROFILING enables rudimentary profiling of the hash table used + to hold active lock queues. # WITNESS enables the witness code which detects deadlocks and cycles # during locking operations. # WITNESS_KDB causes the witness code to drop into the kernel debugger if @@ -298,8 +300,9 @@ options MPROF_HASH_SIZE="1543" # Profiling for internal hash tables. options SLEEPQUEUE_PROFILING options TURNSTILE_PROFILING +options UMTX_PROFILING + - ##################################################################### # COMPATIBILITY OPTIONS Modified: stable/9/sys/conf/options ============================================================================== --- stable/9/sys/conf/options Fri Apr 20 21:37:42 2012 (r234504) +++ stable/9/sys/conf/options Fri Apr 20 21:40:31 2012 (r234505) @@ -184,6 +184,7 @@ SYSVSEM opt_sysvipc.h SYSVSHM opt_sysvipc.h SW_WATCHDOG opt_watchdog.h TURNSTILE_PROFILING +UMTX_PROFILING VFS_AIO VERBOSE_SYSINIT opt_global.h WLCACHE opt_wavelan.h Modified: stable/9/sys/kern/kern_umtx.c ============================================================================== --- stable/9/sys/kern/kern_umtx.c Fri Apr 20 21:37:42 2012 (r234504) +++ stable/9/sys/kern/kern_umtx.c Fri Apr 20 21:40:31 2012 (r234505) @@ -29,6 +29,8 @@ __FBSDID("$FreeBSD$"); #include "opt_compat.h" +#include "opt_umtx_profiling.h" + #include <sys/param.h> #include <sys/kernel.h> #include <sys/limits.h> @@ -154,6 +156,10 @@ struct umtxq_chain { /* All PI in the list */ TAILQ_HEAD(,umtx_pi) uc_pi_list; +#ifdef UMTX_PROFILING + int length; + int max_length; +#endif }; #define UMTXQ_LOCKED_ASSERT(uc) mtx_assert(&(uc)->uc_lock, MA_OWNED) @@ -190,6 +196,12 @@ SYSCTL_NODE(_debug, OID_AUTO, umtx, CTLF SYSCTL_INT(_debug_umtx, OID_AUTO, umtx_pi_allocated, CTLFLAG_RD, &umtx_pi_allocated, 0, "Allocated umtx_pi"); +#ifdef UMTX_PROFILING +static long max_length; +SYSCTL_LONG(_debug_umtx, OID_AUTO, max_length, CTLFLAG_RD, &max_length, 0, "max_length"); +static SYSCTL_NODE(_debug_umtx, OID_AUTO, chains, CTLFLAG_RD, 0, "umtx chain stats"); +#endif + static void umtxq_sysinit(void *); static void umtxq_hash(struct umtx_key *key); static struct umtxq_chain *umtxq_getchain(struct umtx_key *key); @@ -215,6 +227,27 @@ SYSINIT(umtx, SI_SUB_EVENTHANDLER+1, SI_ static struct mtx umtx_lock; +#ifdef UMTX_PROFILING +static void +umtx_init_profiling(void) +{ + struct sysctl_oid *chain_oid; + char chain_name[10]; + int i; + + for (i = 0; i < UMTX_CHAINS; ++i) { + snprintf(chain_name, sizeof(chain_name), "%d", i); + chain_oid = SYSCTL_ADD_NODE(NULL, + SYSCTL_STATIC_CHILDREN(_debug_umtx_chains), OID_AUTO, + chain_name, CTLFLAG_RD, NULL, "umtx hash stats"); + SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO, + "max_length0", CTLFLAG_RD, &umtxq_chains[0][i].max_length, 0, NULL); + SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(chain_oid), OID_AUTO, + "max_length1", CTLFLAG_RD, &umtxq_chains[1][i].max_length, 0, NULL); + } +} +#endif + static void umtxq_sysinit(void *arg __unused) { @@ -232,8 +265,15 @@ umtxq_sysinit(void *arg __unused) TAILQ_INIT(&umtxq_chains[i][j].uc_pi_list); umtxq_chains[i][j].uc_busy = 0; umtxq_chains[i][j].uc_waiters = 0; +#ifdef UMTX_PROFILING + umtxq_chains[i][j].length = 0; + umtxq_chains[i][j].max_length = 0; +#endif } } +#ifdef UMTX_PROFILING + umtx_init_profiling(); +#endif mtx_init(&umtx_lock, "umtx lock", NULL, MTX_SPIN); EVENTHANDLER_REGISTER(process_exec, umtx_exec_hook, NULL, EVENTHANDLER_PRI_ANY); @@ -384,6 +424,14 @@ umtxq_insert_queue(struct umtx_q *uq, in TAILQ_INSERT_TAIL(&uh->head, uq, uq_link); uh->length++; +#ifdef UMTX_PROFILING + uc->length++; + if (uc->length > uc->max_length) { + uc->max_length = uc->length; + if (uc->max_length > max_length) + max_length = uc->max_length; + } +#endif uq->uq_flags |= UQF_UMTXQ; uq->uq_cur_queue = uh; return; @@ -401,6 +449,9 @@ umtxq_remove_queue(struct umtx_q *uq, in uh = uq->uq_cur_queue; TAILQ_REMOVE(&uh->head, uq, uq_link); uh->length--; +#ifdef UMTX_PROFILING + uc->length--; +#endif uq->uq_flags &= ~UQF_UMTXQ; if (TAILQ_EMPTY(&uh->head)) { KASSERT(uh->length == 0,
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