/* * Quicklist support. * * Quicklists are light weight lists of pages that have a defined state * on alloc and free. Pages must be in the quicklist specific defined state * (zero by default) when the page is freed. It seems that the initial idea * for such lists first came from Dave Miller and then various other people * improved on it. * * Copyright (C) 2007 SGI, * Christoph Lameter * Generalized, added support for multiple lists and * constructors / destructors. */ #include #include #include #include #include DEFINE_PER_CPU(struct quicklist [CONFIG_NR_QUICK], quicklist); #define FRACTION_OF_NODE_MEM 16 static unsigned long max_pages(unsigned long min_pages) { unsigned long node_free_pages, max; int node = numa_node_id(); struct zone *zones = NODE_DATA(node)->node_zones; int num_cpus_on_node; node_free_pages = #ifdef CONFIG_ZONE_DMA zone_page_state(&zones[ZONE_DMA], NR_FREE_PAGES) + #endif #ifdef CONFIG_ZONE_DMA32 zone_page_state(&zones[ZONE_DMA32], NR_FREE_PAGES) + #endif zone_page_state(&zones[ZONE_NORMAL], NR_FREE_PAGES); max = node_free_pages / FRACTION_OF_NODE_MEM; num_cpus_on_node = cpumask_weight(cpumask_of_node(node)); max /= num_cpus_on_node; return max(max, min_pages); } static long min_pages_to_free(struct quicklist *q, unsigned long min_pages, long max_free) { long pages_to_free; pages_to_free = q->nr_pages - max_pages(min_pages); return min(pages_to_free, max_free); } /* * Trim down the number of pages in the quicklist */ void quicklist_trim(int nr, void (*dtor)(void *), unsigned long min_pages, unsigned long max_free) { long pages_to_free; struct quicklist *q; q = &get_cpu_var(quicklist)[nr]; if (q->nr_pages > min_pages) { pages_to_free = min_pages_to_free(q, min_pages, max_free); while (pages_to_free > 0) { /* * We pass a gfp_t of 0 to quicklist_alloc here * because we will never call into the page allocator. */ void *p = quicklist_alloc(nr, 0, NULL); if (dtor) dtor(p); free_page((unsigned long)p); pages_to_free--; } } put_cpu_var(quicklist); } unsigned long quicklist_total_size(void) { unsigned long count = 0; int cpu; struct quicklist *ql, *q; for_each_online_cpu(cpu) { ql = per_cpu(quicklist, cpu); for (q = ql; q < ql + CONFIG_NR_QUICK; q++) count += q->nr_pages; } return count; } pe='submit' value='search'/>

path: root/include

Age	Commit message (Expand)	Author	Files	Lines
2017-02-02	netfilter: add and use nf_ct_set helper	Florian Westphal	2	-2/+9
2017-02-02	skbuff: add and use skb_nfct helper	Florian Westphal	2	-4/+11
2017-02-02	netfilter: reduce direct skb->nfct usage	Florian Westphal	1	-3/+6
2017-02-02	netfilter: conntrack: no need to pass ctinfo to error handler	Florian Westphal	1	-1/+1