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| author | Mateusz Guzik <mjg@FreeBSD.org> | 2020-11-11 08:51:04 +0000 |
|---|---|---|
| committer | Mateusz Guzik <mjg@FreeBSD.org> | 2020-11-11 08:51:04 +0000 |
| commit | 26007fe37c06fe0b61634083befb7f9eb87c08c0 (patch) | |
| tree | baddf8e2ab6cf050c724f111679eda8dab191f02 /sys/kern | |
| parent | aae3547be3f9f3072cf41ed1368a488defada7c7 (diff) | |
| download | src-test2-26007fe37c06fe0b61634083befb7f9eb87c08c0.tar.gz src-test2-26007fe37c06fe0b61634083befb7f9eb87c08c0.zip | |
Notes
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/kern_thread.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c index 42a9641f7b8b..da5eaaaf2e34 100644 --- a/sys/kern/kern_thread.c +++ b/sys/kern/kern_thread.c @@ -149,8 +149,10 @@ static int nthreads; static LIST_HEAD(tidhashhead, thread) *tidhashtbl; static u_long tidhash; -static struct rwlock tidhash_lock; -#define TIDHASH(tid) (&tidhashtbl[(tid) & tidhash]) +static u_long tidhashlock; +static struct rwlock *tidhashtbl_lock; +#define TIDHASH(tid) (&tidhashtbl[(tid) & tidhash]) +#define TIDHASHLOCK(tid) (&tidhashtbl_lock[(tid) & tidhashlock]) EVENTHANDLER_LIST_DEFINE(thread_ctor); EVENTHANDLER_LIST_DEFINE(thread_dtor); @@ -355,6 +357,7 @@ extern int max_threads_per_proc; void threadinit(void) { + u_long i; lwpid_t tid0; uint32_t flags; @@ -395,7 +398,13 @@ threadinit(void) thread_ctor, thread_dtor, thread_init, thread_fini, 32 - 1, flags); tidhashtbl = hashinit(maxproc / 2, M_TIDHASH, &tidhash); - rw_init(&tidhash_lock, "tidhash"); + tidhashlock = (tidhash + 1) / 64; + if (tidhashlock > 0) + tidhashlock--; + tidhashtbl_lock = malloc(sizeof(*tidhashtbl_lock) * (tidhashlock + 1), + M_TIDHASH, M_WAITOK | M_ZERO); + for (i = 0; i < tidhashlock + 1; i++) + rw_init(&tidhashtbl_lock[i], "tidhash"); } /* @@ -1351,7 +1360,7 @@ tdfind_hash(lwpid_t tid, pid_t pid, struct proc **pp, struct thread **tdp) bool locked; run = 0; - rw_rlock(&tidhash_lock); + rw_rlock(TIDHASHLOCK(tid)); locked = true; LIST_FOREACH(td, TIDHASH(tid), td_hash) { if (td->td_tid != tid) { @@ -1364,11 +1373,11 @@ tdfind_hash(lwpid_t tid, pid_t pid, struct proc **pp, struct thread **tdp) break; } if (run > RUN_THRESH) { - if (rw_try_upgrade(&tidhash_lock)) { + if (rw_try_upgrade(TIDHASHLOCK(tid))) { LIST_REMOVE(td, td_hash); LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); - rw_wunlock(&tidhash_lock); + rw_wunlock(TIDHASHLOCK(tid)); locked = false; break; } @@ -1376,7 +1385,7 @@ tdfind_hash(lwpid_t tid, pid_t pid, struct proc **pp, struct thread **tdp) break; } if (locked) - rw_runlock(&tidhash_lock); + rw_runlock(TIDHASHLOCK(tid)); if (td == NULL) return (false); *pp = p; @@ -1421,15 +1430,16 @@ tdfind(lwpid_t tid, pid_t pid) void tidhash_add(struct thread *td) { - rw_wlock(&tidhash_lock); + rw_wlock(TIDHASHLOCK(td->td_tid)); LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash); - rw_wunlock(&tidhash_lock); + rw_wunlock(TIDHASHLOCK(td->td_tid)); } void tidhash_remove(struct thread *td) { - rw_wlock(&tidhash_lock); + + rw_wlock(TIDHASHLOCK(td->td_tid)); LIST_REMOVE(td, td_hash); - rw_wunlock(&tidhash_lock); + rw_wunlock(TIDHASHLOCK(td->td_tid)); } |