flow: better memory management
Allocate hash tables for every online cpus, not every possible ones. NUMA aware allocations. Dont use a full page on arches where PAGE_SIZE > 1024*sizeof(void *) misc: __percpu , __read_mostly, __cpuinit annotations flow_compare_t is just an "unsigned long" Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -53,8 +53,7 @@ struct flow_flush_info {
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struct flow_cache {
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u32 hash_shift;
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unsigned long order;
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struct flow_cache_percpu *percpu;
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struct flow_cache_percpu __percpu *percpu;
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struct notifier_block hotcpu_notifier;
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int low_watermark;
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int high_watermark;
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@ -64,7 +63,7 @@ struct flow_cache {
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atomic_t flow_cache_genid = ATOMIC_INIT(0);
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EXPORT_SYMBOL(flow_cache_genid);
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static struct flow_cache flow_cache_global;
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static struct kmem_cache *flow_cachep;
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static struct kmem_cache *flow_cachep __read_mostly;
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static DEFINE_SPINLOCK(flow_cache_gc_lock);
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static LIST_HEAD(flow_cache_gc_list);
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@ -181,11 +180,7 @@ static u32 flow_hash_code(struct flow_cache *fc,
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& (flow_cache_hash_size(fc) - 1));
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}
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#if (BITS_PER_LONG == 64)
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typedef u64 flow_compare_t;
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#else
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typedef u32 flow_compare_t;
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#endif
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typedef unsigned long flow_compare_t;
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/* I hear what you're saying, use memcmp. But memcmp cannot make
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* important assumptions that we can here, such as alignment and
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@ -357,62 +352,73 @@ void flow_cache_flush(void)
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put_online_cpus();
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}
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static void __init flow_cache_cpu_prepare(struct flow_cache *fc,
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struct flow_cache_percpu *fcp)
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static int __cpuinit flow_cache_cpu_prepare(struct flow_cache *fc, int cpu)
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{
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fcp->hash_table = (struct hlist_head *)
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__get_free_pages(GFP_KERNEL|__GFP_ZERO, fc->order);
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if (!fcp->hash_table)
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panic("NET: failed to allocate flow cache order %lu\n", fc->order);
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struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, cpu);
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size_t sz = sizeof(struct hlist_head) * flow_cache_hash_size(fc);
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if (!fcp->hash_table) {
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fcp->hash_table = kzalloc_node(sz, GFP_KERNEL, cpu_to_node(cpu));
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if (!fcp->hash_table) {
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pr_err("NET: failed to allocate flow cache sz %zu\n", sz);
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return -ENOMEM;
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}
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fcp->hash_rnd_recalc = 1;
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fcp->hash_count = 0;
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tasklet_init(&fcp->flush_tasklet, flow_cache_flush_tasklet, 0);
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}
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return 0;
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}
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static int flow_cache_cpu(struct notifier_block *nfb,
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static int __cpuinit flow_cache_cpu(struct notifier_block *nfb,
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unsigned long action,
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void *hcpu)
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{
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struct flow_cache *fc = container_of(nfb, struct flow_cache, hotcpu_notifier);
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int cpu = (unsigned long) hcpu;
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int res, cpu = (unsigned long) hcpu;
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struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, cpu);
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if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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res = flow_cache_cpu_prepare(fc, cpu);
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if (res)
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return notifier_from_errno(res);
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break;
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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__flow_cache_shrink(fc, fcp, 0);
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break;
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}
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return NOTIFY_OK;
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}
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static int flow_cache_init(struct flow_cache *fc)
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static int __init flow_cache_init(struct flow_cache *fc)
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{
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unsigned long order;
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int i;
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fc->hash_shift = 10;
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fc->low_watermark = 2 * flow_cache_hash_size(fc);
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fc->high_watermark = 4 * flow_cache_hash_size(fc);
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for (order = 0;
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(PAGE_SIZE << order) <
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(sizeof(struct hlist_head)*flow_cache_hash_size(fc));
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order++)
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/* NOTHING */;
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fc->order = order;
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fc->percpu = alloc_percpu(struct flow_cache_percpu);
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if (!fc->percpu)
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return -ENOMEM;
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for_each_online_cpu(i) {
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if (flow_cache_cpu_prepare(fc, i))
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return -ENOMEM;
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}
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fc->hotcpu_notifier = (struct notifier_block){
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.notifier_call = flow_cache_cpu,
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};
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register_hotcpu_notifier(&fc->hotcpu_notifier);
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setup_timer(&fc->rnd_timer, flow_cache_new_hashrnd,
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(unsigned long) fc);
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fc->rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;
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add_timer(&fc->rnd_timer);
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for_each_possible_cpu(i)
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flow_cache_cpu_prepare(fc, per_cpu_ptr(fc->percpu, i));
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fc->hotcpu_notifier = (struct notifier_block){
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.notifier_call = flow_cache_cpu,
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};
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register_hotcpu_notifier(&fc->hotcpu_notifier);
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return 0;
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}
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