This fixes two conditions that can incur when migration
is being done in the callout code and harmonizes the macro use.: 1) The callout_active() will lie. Basically if a migration is occuring and the callout is about to expire and the migration has been deferred, the callout_active will no longer return true until after the migration. This confuses and breaks callers that are doing callout_init(&c, 1); such as TCP. 2) The migration code had a bug in it where when migrating, if a two calls to callout_reset came in and they both collided with the callout on the wheel about to run, then the second call to callout_reset would corrupt the list the callout wheel uses putting the callout thread into a endless loop. 3) Per imp, I have fixed all the macro occurance in the code that were for the most part being ignored. Phabricator D1711 and looked at by lstewart and jhb and sbruno. Reviewed by: kostikbel, imp, adrian, hselasky MFC after: 3 days Sponsored by: Netflix Inc.
This commit is contained in:
Randall Stewart
parent
f967066a99
commit
d2854fa488
@ -166,26 +166,16 @@ struct callout_cpu {
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char cc_ktr_event_name[20];
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};
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#define cc_exec_curr cc_exec_entity[0].cc_curr
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#define cc_exec_next cc_exec_entity[0].cc_next
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#define cc_exec_cancel cc_exec_entity[0].cc_cancel
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#define cc_exec_waiting cc_exec_entity[0].cc_waiting
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#define cc_exec_curr_dir cc_exec_entity[1].cc_curr
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#define cc_exec_next_dir cc_exec_entity[1].cc_next
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#define cc_exec_cancel_dir cc_exec_entity[1].cc_cancel
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#define cc_exec_waiting_dir cc_exec_entity[1].cc_waiting
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#define cc_exec_curr(cc, dir) cc->cc_exec_entity[dir].cc_curr
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#define cc_exec_next(cc, dir) cc->cc_exec_entity[dir].cc_next
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#define cc_exec_cancel(cc, dir) cc->cc_exec_entity[dir].cc_cancel
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#define cc_exec_waiting(cc, dir) cc->cc_exec_entity[dir].cc_waiting
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#ifdef SMP
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#define cc_migration_func cc_exec_entity[0].ce_migration_func
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#define cc_migration_arg cc_exec_entity[0].ce_migration_arg
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#define cc_migration_cpu cc_exec_entity[0].ce_migration_cpu
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#define cc_migration_time cc_exec_entity[0].ce_migration_time
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#define cc_migration_prec cc_exec_entity[0].ce_migration_prec
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#define cc_migration_func_dir cc_exec_entity[1].ce_migration_func
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#define cc_migration_arg_dir cc_exec_entity[1].ce_migration_arg
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#define cc_migration_cpu_dir cc_exec_entity[1].ce_migration_cpu
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#define cc_migration_time_dir cc_exec_entity[1].ce_migration_time
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#define cc_migration_prec_dir cc_exec_entity[1].ce_migration_prec
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#define cc_migration_func(cc, dir) cc->cc_exec_entity[dir].ce_migration_func
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#define cc_migration_arg(cc, dir) cc->cc_exec_entity[dir].ce_migration_arg
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#define cc_migration_cpu(cc, dir) cc->cc_exec_entity[dir].ce_migration_cpu
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#define cc_migration_time(cc, dir) cc->cc_exec_entity[dir].ce_migration_time
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#define cc_migration_prec(cc, dir) cc->cc_exec_entity[dir].ce_migration_prec
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struct callout_cpu cc_cpu[MAXCPU];
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#define CPUBLOCK MAXCPU
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@ -235,16 +225,16 @@ static void
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cc_cce_cleanup(struct callout_cpu *cc, int direct)
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{
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cc->cc_exec_entity[direct].cc_curr = NULL;
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cc->cc_exec_entity[direct].cc_next = NULL;
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cc->cc_exec_entity[direct].cc_cancel = false;
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cc->cc_exec_entity[direct].cc_waiting = false;
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cc_exec_curr(cc, direct) = NULL;
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cc_exec_next(cc, direct) = NULL;
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cc_exec_cancel(cc, direct) = false;
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cc_exec_waiting(cc, direct) = false;
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#ifdef SMP
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cc->cc_exec_entity[direct].ce_migration_cpu = CPUBLOCK;
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cc->cc_exec_entity[direct].ce_migration_time = 0;
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cc->cc_exec_entity[direct].ce_migration_prec = 0;
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cc->cc_exec_entity[direct].ce_migration_func = NULL;
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cc->cc_exec_entity[direct].ce_migration_arg = NULL;
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cc_migration_cpu(cc, direct) = CPUBLOCK;
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cc_migration_time(cc, direct) = 0;
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cc_migration_prec(cc, direct) = 0;
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cc_migration_func(cc, direct) = NULL;
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cc_migration_arg(cc, direct) = NULL;
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#endif
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}
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@ -256,7 +246,7 @@ cc_cce_migrating(struct callout_cpu *cc, int direct)
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{
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#ifdef SMP
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return (cc->cc_exec_entity[direct].ce_migration_cpu != CPUBLOCK);
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return (cc_migration_cpu(cc, direct) != CPUBLOCK);
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#else
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return (0);
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#endif
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@ -492,7 +482,7 @@ callout_process(sbintime_t now)
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#ifdef CALLOUT_PROFILING
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++depth_dir;
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#endif
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cc->cc_exec_next_dir =
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cc_exec_next(cc, 1) =
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LIST_NEXT(tmp, c_links.le);
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cc->cc_bucket = firstb & callwheelmask;
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LIST_REMOVE(tmp, c_links.le);
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@ -501,7 +491,7 @@ callout_process(sbintime_t now)
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&mpcalls_dir, &lockcalls_dir, NULL,
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#endif
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1);
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tmp = cc->cc_exec_next_dir;
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tmp = cc_exec_next(cc, 1);
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} else {
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tmpn = LIST_NEXT(tmp, c_links.le);
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LIST_REMOVE(tmp, c_links.le);
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@ -585,7 +575,7 @@ callout_lock(struct callout *c)
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static void
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callout_cc_add(struct callout *c, struct callout_cpu *cc,
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sbintime_t sbt, sbintime_t precision, void (*func)(void *),
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void *arg, int cpu, int flags)
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void *arg, int cpu, int flags, int direct)
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{
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int bucket;
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@ -606,7 +596,7 @@ callout_cc_add(struct callout *c, struct callout_cpu *cc,
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(u_int)(c->c_precision & 0xffffffff));
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LIST_INSERT_HEAD(&cc->cc_callwheel[bucket], c, c_links.le);
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if (cc->cc_bucket == bucket)
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cc->cc_exec_next_dir = c;
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cc_exec_next(cc, direct) = c;
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#ifndef NO_EVENTTIMERS
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/*
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* Inform the eventtimers(4) subsystem there's a new callout
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@ -679,8 +669,9 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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c->c_flags = CALLOUT_LOCAL_ALLOC;
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else
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c->c_flags &= ~CALLOUT_PENDING;
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cc->cc_exec_entity[direct].cc_curr = c;
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cc->cc_exec_entity[direct].cc_cancel = false;
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cc_exec_curr(cc, direct) = c;
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cc_exec_cancel(cc, direct) = false;
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CC_UNLOCK(cc);
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if (c_lock != NULL) {
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class->lc_lock(c_lock, lock_status);
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@ -688,12 +679,12 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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* The callout may have been cancelled
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* while we switched locks.
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*/
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if (cc->cc_exec_entity[direct].cc_cancel) {
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if (cc_exec_cancel(cc, direct)) {
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class->lc_unlock(c_lock);
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goto skip;
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}
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/* The callout cannot be stopped now. */
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cc->cc_exec_entity[direct].cc_cancel = true;
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cc_exec_cancel(cc, direct) = true;
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if (c_lock == &Giant.lock_object) {
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#ifdef CALLOUT_PROFILING
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(*gcalls)++;
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@ -744,9 +735,9 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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class->lc_unlock(c_lock);
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skip:
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CC_LOCK(cc);
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KASSERT(cc->cc_exec_entity[direct].cc_curr == c, ("mishandled cc_curr"));
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cc->cc_exec_entity[direct].cc_curr = NULL;
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if (cc->cc_exec_entity[direct].cc_waiting) {
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KASSERT(cc_exec_curr(cc, direct) == c, ("mishandled cc_curr"));
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cc_exec_curr(cc, direct) = NULL;
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if (cc_exec_waiting(cc, direct)) {
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/*
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* There is someone waiting for the
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* callout to complete.
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@ -762,9 +753,9 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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*/
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c->c_flags &= ~CALLOUT_DFRMIGRATION;
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}
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cc->cc_exec_entity[direct].cc_waiting = false;
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cc_exec_waiting(cc, direct) = false;
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CC_UNLOCK(cc);
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wakeup(&cc->cc_exec_entity[direct].cc_waiting);
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wakeup(&cc_exec_waiting(cc, direct));
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CC_LOCK(cc);
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} else if (cc_cce_migrating(cc, direct)) {
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KASSERT((c_flags & CALLOUT_LOCAL_ALLOC) == 0,
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@ -774,11 +765,11 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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* If the callout was scheduled for
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* migration just perform it now.
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*/
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new_cpu = cc->cc_exec_entity[direct].ce_migration_cpu;
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new_time = cc->cc_exec_entity[direct].ce_migration_time;
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new_prec = cc->cc_exec_entity[direct].ce_migration_prec;
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new_func = cc->cc_exec_entity[direct].ce_migration_func;
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new_arg = cc->cc_exec_entity[direct].ce_migration_arg;
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new_cpu = cc_migration_cpu(cc, direct);
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new_time = cc_migration_time(cc, direct);
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new_prec = cc_migration_prec(cc, direct);
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new_func = cc_migration_func(cc, direct);
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new_arg = cc_migration_arg(cc, direct);
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cc_cce_cleanup(cc, direct);
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/*
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@ -787,7 +778,7 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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*
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* As first thing, handle deferred callout stops.
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*/
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if ((c->c_flags & CALLOUT_DFRMIGRATION) == 0) {
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if (!callout_migrating(c)) {
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CTR3(KTR_CALLOUT,
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"deferred cancelled %p func %p arg %p",
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c, new_func, new_arg);
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@ -799,7 +790,7 @@ softclock_call_cc(struct callout *c, struct callout_cpu *cc,
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new_cc = callout_cpu_switch(c, cc, new_cpu);
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flags = (direct) ? C_DIRECT_EXEC : 0;
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callout_cc_add(c, new_cc, new_time, new_prec, new_func,
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new_arg, new_cpu, flags);
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new_arg, new_cpu, flags, direct);
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CC_UNLOCK(new_cc);
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CC_LOCK(cc);
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#else
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@ -1007,15 +998,15 @@ callout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision,
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KASSERT(!direct || c->c_lock == NULL,
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("%s: direct callout %p has lock", __func__, c));
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cc = callout_lock(c);
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if (cc->cc_exec_entity[direct].cc_curr == c) {
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if (cc_exec_curr(cc, direct) == c) {
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/*
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* We're being asked to reschedule a callout which is
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* currently in progress. If there is a lock then we
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* can cancel the callout if it has not really started.
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*/
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if (c->c_lock != NULL && !cc->cc_exec_entity[direct].cc_cancel)
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cancelled = cc->cc_exec_entity[direct].cc_cancel = true;
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if (cc->cc_exec_entity[direct].cc_waiting) {
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if (c->c_lock != NULL && cc_exec_cancel(cc, direct))
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cancelled = cc_exec_cancel(cc, direct) = true;
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if (cc_exec_waiting(cc, direct)) {
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/*
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* Someone has called callout_drain to kill this
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* callout. Don't reschedule.
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@ -1026,11 +1017,30 @@ callout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision,
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CC_UNLOCK(cc);
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return (cancelled);
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}
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#ifdef SMP
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if (callout_migrating(c)) {
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/*
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* This only occurs when a second callout_reset_sbt_on
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* is made after a previous one moved it into
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* deferred migration (below). Note we do *not* change
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* the prev_cpu even though the previous target may
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* be different.
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*/
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cc_migration_cpu(cc, direct) = cpu;
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cc_migration_time(cc, direct) = to_sbt;
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cc_migration_prec(cc, direct) = precision;
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cc_migration_func(cc, direct) = ftn;
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cc_migration_arg(cc, direct) = arg;
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cancelled = 1;
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CC_UNLOCK(cc);
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return (cancelled);
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}
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#endif
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}
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if (c->c_flags & CALLOUT_PENDING) {
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if ((c->c_flags & CALLOUT_PROCESSED) == 0) {
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if (cc->cc_exec_next_dir == c)
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cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le);
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if (cc_exec_next(cc, direct) == c)
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cc_exec_next(cc, direct) = LIST_NEXT(c, c_links.le);
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LIST_REMOVE(c, c_links.le);
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} else
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TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe);
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@ -1045,15 +1055,29 @@ callout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision,
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* to a more appropriate moment.
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*/
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if (c->c_cpu != cpu) {
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if (cc->cc_exec_entity[direct].cc_curr == c) {
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cc->cc_exec_entity[direct].ce_migration_cpu = cpu;
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cc->cc_exec_entity[direct].ce_migration_time
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= to_sbt;
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cc->cc_exec_entity[direct].ce_migration_prec
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= precision;
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cc->cc_exec_entity[direct].ce_migration_func = ftn;
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cc->cc_exec_entity[direct].ce_migration_arg = arg;
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c->c_flags |= CALLOUT_DFRMIGRATION;
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if (cc_exec_curr(cc, direct) == c) {
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/*
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* Pending will have been removed since we are
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* actually executing the callout on another
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* CPU. That callout should be waiting on the
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* lock the caller holds. If we set both
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* active/and/pending after we return and the
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* lock on the executing callout proceeds, it
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* will then see pending is true and return.
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* At the return from the actual callout execution
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* the migration will occur in softclock_call_cc
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* and this new callout will be placed on the
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* new CPU via a call to callout_cpu_switch() which
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* will get the lock on the right CPU followed
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* by a call callout_cc_add() which will add it there.
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* (see above in softclock_call_cc()).
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*/
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cc_migration_cpu(cc, direct) = cpu;
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cc_migration_time(cc, direct) = to_sbt;
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cc_migration_prec(cc, direct) = precision;
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cc_migration_func(cc, direct) = ftn;
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cc_migration_arg(cc, direct) = arg;
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c->c_flags |= (CALLOUT_DFRMIGRATION | CALLOUT_ACTIVE | CALLOUT_PENDING);
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CTR6(KTR_CALLOUT,
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"migration of %p func %p arg %p in %d.%08x to %u deferred",
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c, c->c_func, c->c_arg, (int)(to_sbt >> 32),
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@ -1065,7 +1089,7 @@ callout_reset_sbt_on(struct callout *c, sbintime_t sbt, sbintime_t precision,
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}
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#endif
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callout_cc_add(c, cc, to_sbt, precision, ftn, arg, cpu, flags);
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callout_cc_add(c, cc, to_sbt, precision, ftn, arg, cpu, flags, direct);
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CTR6(KTR_CALLOUT, "%sscheduled %p func %p arg %p in %d.%08x",
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cancelled ? "re" : "", c, c->c_func, c->c_arg, (int)(to_sbt >> 32),
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(u_int)(to_sbt & 0xffffffff));
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@ -1095,6 +1119,7 @@ _callout_stop_safe(struct callout *c, int safe)
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struct callout_cpu *cc, *old_cc;
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struct lock_class *class;
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int direct, sq_locked, use_lock;
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int not_on_a_list;
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if (safe)
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, c->c_lock,
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@ -1120,6 +1145,26 @@ _callout_stop_safe(struct callout *c, int safe)
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again:
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cc = callout_lock(c);
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if ((c->c_flags & (CALLOUT_DFRMIGRATION | CALLOUT_ACTIVE | CALLOUT_PENDING)) ==
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(CALLOUT_DFRMIGRATION | CALLOUT_ACTIVE | CALLOUT_PENDING)) {
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/*
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* Special case where this slipped in while we
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* were migrating *as* the callout is about to
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* execute. The caller probably holds the lock
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* the callout wants.
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*
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* Get rid of the migration first. Then set
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* the flag that tells this code *not* to
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* try to remove it from any lists (its not
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* on one yet). When the callout wheel runs,
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* it will ignore this callout.
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*/
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c->c_flags &= ~(CALLOUT_PENDING|CALLOUT_ACTIVE);
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not_on_a_list = 1;
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} else {
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not_on_a_list = 0;
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}
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/*
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* If the callout was migrating while the callout cpu lock was
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* dropped, just drop the sleepqueue lock and check the states
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@ -1128,7 +1173,7 @@ _callout_stop_safe(struct callout *c, int safe)
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if (sq_locked != 0 && cc != old_cc) {
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#ifdef SMP
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CC_UNLOCK(cc);
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sleepq_release(&old_cc->cc_exec_entity[direct].cc_waiting);
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sleepq_release(&cc_exec_waiting(old_cc, direct));
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sq_locked = 0;
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old_cc = NULL;
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goto again;
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@ -1149,13 +1194,12 @@ _callout_stop_safe(struct callout *c, int safe)
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* If it wasn't on the queue and it isn't the current
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* callout, then we can't stop it, so just bail.
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*/
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if (cc->cc_exec_entity[direct].cc_curr != c) {
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if (cc_exec_curr(cc, direct) != c) {
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CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p",
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c, c->c_func, c->c_arg);
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CC_UNLOCK(cc);
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if (sq_locked)
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sleepq_release(
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&cc->cc_exec_entity[direct].cc_waiting);
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sleepq_release(&cc_exec_waiting(cc, direct));
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return (0);
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}
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@ -1166,7 +1210,7 @@ _callout_stop_safe(struct callout *c, int safe)
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* just wait for the current invocation to
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* finish.
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*/
|
||||
while (cc->cc_exec_entity[direct].cc_curr == c) {
|
||||
while (cc_exec_curr(cc, direct) == c) {
|
||||
/*
|
||||
* Use direct calls to sleepqueue interface
|
||||
* instead of cv/msleep in order to avoid
|
||||
@ -1187,7 +1231,7 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
if (!sq_locked) {
|
||||
CC_UNLOCK(cc);
|
||||
sleepq_lock(
|
||||
&cc->cc_exec_entity[direct].cc_waiting);
|
||||
&cc_exec_waiting(cc, direct));
|
||||
sq_locked = 1;
|
||||
old_cc = cc;
|
||||
goto again;
|
||||
@ -1199,15 +1243,15 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
* will be packed up, just let softclock()
|
||||
* take care of it.
|
||||
*/
|
||||
cc->cc_exec_entity[direct].cc_waiting = true;
|
||||
cc_exec_waiting(cc, direct) = true;
|
||||
DROP_GIANT();
|
||||
CC_UNLOCK(cc);
|
||||
sleepq_add(
|
||||
&cc->cc_exec_entity[direct].cc_waiting,
|
||||
&cc_exec_waiting(cc, direct),
|
||||
&cc->cc_lock.lock_object, "codrain",
|
||||
SLEEPQ_SLEEP, 0);
|
||||
sleepq_wait(
|
||||
&cc->cc_exec_entity[direct].cc_waiting,
|
||||
&cc_exec_waiting(cc, direct),
|
||||
0);
|
||||
sq_locked = 0;
|
||||
old_cc = NULL;
|
||||
@ -1217,7 +1261,8 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
CC_LOCK(cc);
|
||||
}
|
||||
} else if (use_lock &&
|
||||
!cc->cc_exec_entity[direct].cc_cancel) {
|
||||
!cc_exec_cancel(cc, direct)) {
|
||||
|
||||
/*
|
||||
* The current callout is waiting for its
|
||||
* lock which we hold. Cancel the callout
|
||||
@ -1225,7 +1270,7 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
* lock, the callout will be skipped in
|
||||
* softclock().
|
||||
*/
|
||||
cc->cc_exec_entity[direct].cc_cancel = true;
|
||||
cc_exec_cancel(cc, direct) = true;
|
||||
CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p",
|
||||
c, c->c_func, c->c_arg);
|
||||
KASSERT(!cc_cce_migrating(cc, direct),
|
||||
@ -1233,12 +1278,34 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
CC_UNLOCK(cc);
|
||||
KASSERT(!sq_locked, ("sleepqueue chain locked"));
|
||||
return (1);
|
||||
} else if ((c->c_flags & CALLOUT_DFRMIGRATION) != 0) {
|
||||
} else if (callout_migrating(c)) {
|
||||
/*
|
||||
* The callout is currently being serviced
|
||||
* and the "next" callout is scheduled at
|
||||
* its completion with a migration. We remove
|
||||
* the migration flag so it *won't* get rescheduled,
|
||||
* but we can't stop the one thats running so
|
||||
* we return 0.
|
||||
*/
|
||||
c->c_flags &= ~CALLOUT_DFRMIGRATION;
|
||||
#ifdef SMP
|
||||
/*
|
||||
* We can't call cc_cce_cleanup here since
|
||||
* if we do it will remove .ce_curr and
|
||||
* its still running. This will prevent a
|
||||
* reschedule of the callout when the
|
||||
* execution completes.
|
||||
*/
|
||||
cc_migration_cpu(cc, direct) = CPUBLOCK;
|
||||
cc_migration_time(cc, direct) = 0;
|
||||
cc_migration_prec(cc, direct) = 0;
|
||||
cc_migration_func(cc, direct) = NULL;
|
||||
cc_migration_arg(cc, direct) = NULL;
|
||||
#endif
|
||||
CTR3(KTR_CALLOUT, "postponing stop %p func %p arg %p",
|
||||
c, c->c_func, c->c_arg);
|
||||
CC_UNLOCK(cc);
|
||||
return (1);
|
||||
return (0);
|
||||
}
|
||||
CTR3(KTR_CALLOUT, "failed to stop %p func %p arg %p",
|
||||
c, c->c_func, c->c_arg);
|
||||
@ -1247,20 +1314,21 @@ _callout_stop_safe(struct callout *c, int safe)
|
||||
return (0);
|
||||
}
|
||||
if (sq_locked)
|
||||
sleepq_release(&cc->cc_exec_entity[direct].cc_waiting);
|
||||
sleepq_release(&cc_exec_waiting(cc, direct));
|
||||
|
||||
c->c_flags &= ~(CALLOUT_ACTIVE | CALLOUT_PENDING);
|
||||
|
||||
CTR3(KTR_CALLOUT, "cancelled %p func %p arg %p",
|
||||
c, c->c_func, c->c_arg);
|
||||
if ((c->c_flags & CALLOUT_PROCESSED) == 0) {
|
||||
if (cc->cc_exec_next_dir == c)
|
||||
cc->cc_exec_next_dir = LIST_NEXT(c, c_links.le);
|
||||
LIST_REMOVE(c, c_links.le);
|
||||
} else
|
||||
TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe);
|
||||
if (not_on_a_list == 0) {
|
||||
if ((c->c_flags & CALLOUT_PROCESSED) == 0) {
|
||||
if (cc_exec_next(cc, direct) == c)
|
||||
cc_exec_next(cc, direct) = LIST_NEXT(c, c_links.le);
|
||||
LIST_REMOVE(c, c_links.le);
|
||||
} else
|
||||
TAILQ_REMOVE(&cc->cc_expireq, c, c_links.tqe);
|
||||
}
|
||||
callout_cc_del(c, cc);
|
||||
|
||||
CC_UNLOCK(cc);
|
||||
return (1);
|
||||
}
|
||||
|
||||
@ -64,6 +64,7 @@ struct callout_handle {
|
||||
|
||||
#ifdef _KERNEL
|
||||
#define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
|
||||
#define callout_migrating(c) ((c)->c_flags & CALLOUT_DFRMIGRATION)
|
||||
#define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
|
||||
#define callout_drain(c) _callout_stop_safe(c, 1)
|
||||
void callout_init(struct callout *, int);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user