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author | 2023-03-17 18:29:38 -0700 | |
---|---|---|
committer | 2023-04-04 08:36:07 -0700 | |
commit | b3fb11f7e9c3c64dd86403409a070c996d8ac081 (patch) | |
tree | 2494a8e1eaa9f5ba1121fbe435aee0bf1c1315b9 /kernel/rcu | |
parent | srcu: Move ->lock initialization after srcu_usage allocation (diff) | |
download | linux-b3fb11f7e9c3c64dd86403409a070c996d8ac081.tar.gz linux-b3fb11f7e9c3c64dd86403409a070c996d8ac081.tar.bz2 linux-b3fb11f7e9c3c64dd86403409a070c996d8ac081.zip |
srcu: Move ->lock from srcu_struct to srcu_usage
This commit moves the ->lock field from the srcu_struct structure to
the srcu_usage structure to reduce the size of the former in order to
improve cache locality.
Suggested-by: Christoph Hellwig <hch@lst.de>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com>
Tested-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r-- | kernel/rcu/srcutree.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index c2a024a60f1a..c42248cf18f6 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -103,7 +103,7 @@ do { \ #define spin_trylock_irqsave_rcu_node(p, flags) \ ({ \ - bool ___locked = spin_trylock_irqsave(&ACCESS_PRIVATE(p, lock), flags); \ + bool ___locked = spin_trylock_irqsave(&ACCESS_PRIVATE(p, lock), flags); \ \ if (___locked) \ smp_mb__after_unlock_lock(); \ @@ -241,7 +241,7 @@ static int init_srcu_struct_fields(struct srcu_struct *ssp, bool is_static) if (!ssp->srcu_sup) return -ENOMEM; if (!is_static) - spin_lock_init(&ACCESS_PRIVATE(ssp, lock)); + spin_lock_init(&ACCESS_PRIVATE(ssp->srcu_sup, lock)); ssp->srcu_sup->srcu_size_state = SRCU_SIZE_SMALL; ssp->srcu_sup->node = NULL; mutex_init(&ssp->srcu_sup->srcu_cb_mutex); @@ -314,7 +314,7 @@ EXPORT_SYMBOL_GPL(init_srcu_struct); */ static void __srcu_transition_to_big(struct srcu_struct *ssp) { - lockdep_assert_held(&ACCESS_PRIVATE(ssp, lock)); + lockdep_assert_held(&ACCESS_PRIVATE(ssp->srcu_sup, lock)); smp_store_release(&ssp->srcu_sup->srcu_size_state, SRCU_SIZE_ALLOC); } @@ -328,13 +328,13 @@ static void srcu_transition_to_big(struct srcu_struct *ssp) /* Double-checked locking on ->srcu_size-state. */ if (smp_load_acquire(&ssp->srcu_sup->srcu_size_state) != SRCU_SIZE_SMALL) return; - spin_lock_irqsave_rcu_node(ssp, flags); + spin_lock_irqsave_rcu_node(ssp->srcu_sup, flags); if (smp_load_acquire(&ssp->srcu_sup->srcu_size_state) != SRCU_SIZE_SMALL) { - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); return; } __srcu_transition_to_big(ssp); - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); } /* @@ -369,9 +369,9 @@ static void spin_lock_irqsave_sdp_contention(struct srcu_data *sdp, unsigned lon if (spin_trylock_irqsave_rcu_node(sdp, *flags)) return; - spin_lock_irqsave_rcu_node(ssp, *flags); + spin_lock_irqsave_rcu_node(ssp->srcu_sup, *flags); spin_lock_irqsave_check_contention(ssp); - spin_unlock_irqrestore_rcu_node(ssp, *flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, *flags); spin_lock_irqsave_rcu_node(sdp, *flags); } @@ -383,9 +383,9 @@ static void spin_lock_irqsave_sdp_contention(struct srcu_data *sdp, unsigned lon */ static void spin_lock_irqsave_ssp_contention(struct srcu_struct *ssp, unsigned long *flags) { - if (spin_trylock_irqsave_rcu_node(ssp, *flags)) + if (spin_trylock_irqsave_rcu_node(ssp->srcu_sup, *flags)) return; - spin_lock_irqsave_rcu_node(ssp, *flags); + spin_lock_irqsave_rcu_node(ssp->srcu_sup, *flags); spin_lock_irqsave_check_contention(ssp); } @@ -404,13 +404,13 @@ static void check_init_srcu_struct(struct srcu_struct *ssp) /* The smp_load_acquire() pairs with the smp_store_release(). */ if (!rcu_seq_state(smp_load_acquire(&ssp->srcu_gp_seq_needed))) /*^^^*/ return; /* Already initialized. */ - spin_lock_irqsave_rcu_node(ssp, flags); + spin_lock_irqsave_rcu_node(ssp->srcu_sup, flags); if (!rcu_seq_state(ssp->srcu_gp_seq_needed)) { - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); return; } init_srcu_struct_fields(ssp, true); - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); } /* @@ -774,7 +774,7 @@ static void srcu_gp_start(struct srcu_struct *ssp) sdp = per_cpu_ptr(ssp->sda, get_boot_cpu_id()); else sdp = this_cpu_ptr(ssp->sda); - lockdep_assert_held(&ACCESS_PRIVATE(ssp, lock)); + lockdep_assert_held(&ACCESS_PRIVATE(ssp->srcu_sup, lock)); WARN_ON_ONCE(ULONG_CMP_GE(ssp->srcu_gp_seq, ssp->srcu_gp_seq_needed)); spin_lock_rcu_node(sdp); /* Interrupts already disabled. */ rcu_segcblist_advance(&sdp->srcu_cblist, @@ -864,7 +864,7 @@ static void srcu_gp_end(struct srcu_struct *ssp) mutex_lock(&ssp->srcu_sup->srcu_cb_mutex); /* End the current grace period. */ - spin_lock_irq_rcu_node(ssp); + spin_lock_irq_rcu_node(ssp->srcu_sup); idx = rcu_seq_state(ssp->srcu_gp_seq); WARN_ON_ONCE(idx != SRCU_STATE_SCAN2); if (ULONG_CMP_LT(READ_ONCE(ssp->srcu_gp_seq), READ_ONCE(ssp->srcu_gp_seq_needed_exp))) @@ -875,7 +875,7 @@ static void srcu_gp_end(struct srcu_struct *ssp) gpseq = rcu_seq_current(&ssp->srcu_gp_seq); if (ULONG_CMP_LT(ssp->srcu_gp_seq_needed_exp, gpseq)) WRITE_ONCE(ssp->srcu_gp_seq_needed_exp, gpseq); - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); mutex_unlock(&ssp->srcu_gp_mutex); /* A new grace period can start at this point. But only one. */ @@ -924,15 +924,15 @@ static void srcu_gp_end(struct srcu_struct *ssp) mutex_unlock(&ssp->srcu_sup->srcu_cb_mutex); /* Start a new grace period if needed. */ - spin_lock_irq_rcu_node(ssp); + spin_lock_irq_rcu_node(ssp->srcu_sup); gpseq = rcu_seq_current(&ssp->srcu_gp_seq); if (!rcu_seq_state(gpseq) && ULONG_CMP_LT(gpseq, ssp->srcu_gp_seq_needed)) { srcu_gp_start(ssp); - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); srcu_reschedule(ssp, 0); } else { - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); } /* Transition to big if needed. */ @@ -975,7 +975,7 @@ static void srcu_funnel_exp_start(struct srcu_struct *ssp, struct srcu_node *snp spin_lock_irqsave_ssp_contention(ssp, &flags); if (ULONG_CMP_LT(ssp->srcu_gp_seq_needed_exp, s)) WRITE_ONCE(ssp->srcu_gp_seq_needed_exp, s); - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); } /* @@ -1064,7 +1064,7 @@ static void srcu_funnel_gp_start(struct srcu_struct *ssp, struct srcu_data *sdp, else if (list_empty(&ssp->work.work.entry)) list_add(&ssp->work.work.entry, &srcu_boot_list); } - spin_unlock_irqrestore_rcu_node(ssp, flags); + spin_unlock_irqrestore_rcu_node(ssp->srcu_sup, flags); } /* @@ -1599,17 +1599,17 @@ static void srcu_advance_state(struct srcu_struct *ssp) */ idx = rcu_seq_state(smp_load_acquire(&ssp->srcu_gp_seq)); /* ^^^ */ if (idx == SRCU_STATE_IDLE) { - spin_lock_irq_rcu_node(ssp); + spin_lock_irq_rcu_node(ssp->srcu_sup); if (ULONG_CMP_GE(ssp->srcu_gp_seq, ssp->srcu_gp_seq_needed)) { WARN_ON_ONCE(rcu_seq_state(ssp->srcu_gp_seq)); - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); mutex_unlock(&ssp->srcu_gp_mutex); return; } idx = rcu_seq_state(READ_ONCE(ssp->srcu_gp_seq)); if (idx == SRCU_STATE_IDLE) srcu_gp_start(ssp); - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); if (idx != SRCU_STATE_IDLE) { mutex_unlock(&ssp->srcu_gp_mutex); return; /* Someone else started the grace period. */ @@ -1623,10 +1623,10 @@ static void srcu_advance_state(struct srcu_struct *ssp) return; /* readers present, retry later. */ } srcu_flip(ssp); - spin_lock_irq_rcu_node(ssp); + spin_lock_irq_rcu_node(ssp->srcu_sup); rcu_seq_set_state(&ssp->srcu_gp_seq, SRCU_STATE_SCAN2); ssp->srcu_n_exp_nodelay = 0; - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); } if (rcu_seq_state(READ_ONCE(ssp->srcu_gp_seq)) == SRCU_STATE_SCAN2) { @@ -1710,7 +1710,7 @@ static void srcu_reschedule(struct srcu_struct *ssp, unsigned long delay) { bool pushgp = true; - spin_lock_irq_rcu_node(ssp); + spin_lock_irq_rcu_node(ssp->srcu_sup); if (ULONG_CMP_GE(ssp->srcu_gp_seq, ssp->srcu_gp_seq_needed)) { if (!WARN_ON_ONCE(rcu_seq_state(ssp->srcu_gp_seq))) { /* All requests fulfilled, time to go idle. */ @@ -1720,7 +1720,7 @@ static void srcu_reschedule(struct srcu_struct *ssp, unsigned long delay) /* Outstanding request and no GP. Start one. */ srcu_gp_start(ssp); } - spin_unlock_irq_rcu_node(ssp); + spin_unlock_irq_rcu_node(ssp->srcu_sup); if (pushgp) queue_delayed_work(rcu_gp_wq, &ssp->work, delay); |