Commit-ID: 5c903e108d0b005cf59904ca3520934fca4b9439 Gitweb: https://git.kernel.org/tip/5c903e108d0b005cf59904ca3520934fca4b9439 Author: Ming Lei <ming....@redhat.com> AuthorDate: Fri, 2 Nov 2018 22:59:49 +0800 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Mon, 5 Nov 2018 12:16:26 +0100
genirq/affinity: Move two stage affinity spreading into a helper function No functional change. Prepares for supporting allocating and affinitizing interrupt sets. [ tglx: Minor changelog tweaks ] Signed-off-by: Ming Lei <ming....@redhat.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: Jens Axboe <ax...@kernel.dk> Cc: linux-bl...@vger.kernel.org Cc: Hannes Reinecke <h...@suse.com> Cc: Keith Busch <keith.bu...@intel.com> Cc: Sagi Grimberg <s...@grimberg.me> Link: https://lkml.kernel.org/r/20181102145951.31979-3-ming....@redhat.com --- kernel/irq/affinity.c | 92 +++++++++++++++++++++++++++++++-------------------- 1 file changed, 56 insertions(+), 36 deletions(-) diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index e12cdf637c71..2f9812b6035e 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -94,7 +94,7 @@ static int get_nodes_in_cpumask(cpumask_var_t *node_to_cpumask, return nodes; } -static int irq_build_affinity_masks(const struct irq_affinity *affd, +static int __irq_build_affinity_masks(const struct irq_affinity *affd, int startvec, int numvecs, cpumask_var_t *node_to_cpumask, const struct cpumask *cpu_mask, @@ -165,6 +165,58 @@ out: return done; } +/* + * build affinity in two stages: + * 1) spread present CPU on these vectors + * 2) spread other possible CPUs on these vectors + */ +static int irq_build_affinity_masks(const struct irq_affinity *affd, + int startvec, int numvecs, + cpumask_var_t *node_to_cpumask, + struct cpumask *masks) +{ + int curvec = startvec, usedvecs = -1; + cpumask_var_t nmsk, npresmsk; + + if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL)) + return usedvecs; + + if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL)) + goto fail; + + /* Stabilize the cpumasks */ + get_online_cpus(); + build_node_to_cpumask(node_to_cpumask); + + /* Spread on present CPUs starting from affd->pre_vectors */ + usedvecs = __irq_build_affinity_masks(affd, curvec, numvecs, + node_to_cpumask, cpu_present_mask, + nmsk, masks); + + /* + * Spread on non present CPUs starting from the next vector to be + * handled. If the spreading of present CPUs already exhausted the + * vector space, assign the non present CPUs to the already spread + * out vectors. + */ + if (usedvecs >= numvecs) + curvec = affd->pre_vectors; + else + curvec = affd->pre_vectors + usedvecs; + cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask); + usedvecs += __irq_build_affinity_masks(affd, curvec, numvecs, + node_to_cpumask, npresmsk, + nmsk, masks); + put_online_cpus(); + + free_cpumask_var(npresmsk); + + fail: + free_cpumask_var(nmsk); + + return usedvecs; +} + /** * irq_create_affinity_masks - Create affinity masks for multiqueue spreading * @nvecs: The total number of vectors @@ -177,7 +229,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) { int affvecs = nvecs - affd->pre_vectors - affd->post_vectors; int curvec, usedvecs; - cpumask_var_t nmsk, npresmsk, *node_to_cpumask; + cpumask_var_t *node_to_cpumask; struct cpumask *masks = NULL; /* @@ -187,15 +239,9 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) if (nvecs == affd->pre_vectors + affd->post_vectors) return NULL; - if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL)) - return NULL; - - if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL)) - goto outcpumsk; - node_to_cpumask = alloc_node_to_cpumask(); if (!node_to_cpumask) - goto outnpresmsk; + return NULL; masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL); if (!masks) @@ -205,30 +251,8 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) for (curvec = 0; curvec < affd->pre_vectors; curvec++) cpumask_copy(masks + curvec, irq_default_affinity); - /* Stabilize the cpumasks */ - get_online_cpus(); - build_node_to_cpumask(node_to_cpumask); - - /* Spread on present CPUs starting from affd->pre_vectors */ usedvecs = irq_build_affinity_masks(affd, curvec, affvecs, - node_to_cpumask, cpu_present_mask, - nmsk, masks); - - /* - * Spread on non present CPUs starting from the next vector to be - * handled. If the spreading of present CPUs already exhausted the - * vector space, assign the non present CPUs to the already spread - * out vectors. - */ - if (usedvecs >= affvecs) - curvec = affd->pre_vectors; - else - curvec = affd->pre_vectors + usedvecs; - cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask); - usedvecs += irq_build_affinity_masks(affd, curvec, affvecs, - node_to_cpumask, npresmsk, - nmsk, masks); - put_online_cpus(); + node_to_cpumask, masks); /* Fill out vectors at the end that don't need affinity */ if (usedvecs >= affvecs) @@ -240,10 +264,6 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) outnodemsk: free_node_to_cpumask(node_to_cpumask); -outnpresmsk: - free_cpumask_var(npresmsk); -outcpumsk: - free_cpumask_var(nmsk); return masks; }
