forked from luck/tmp_suning_uos_patched
e25934a517
There is nothing modular in these files, and no reason to drag in all the 357 headers that module.h brings with it, since it just slows down compiles. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/*
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* Quicklist support.
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*
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* Quicklists are light weight lists of pages that have a defined state
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* on alloc and free. Pages must be in the quicklist specific defined state
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* (zero by default) when the page is freed. It seems that the initial idea
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* for such lists first came from Dave Miller and then various other people
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* improved on it.
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*
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* Copyright (C) 2007 SGI,
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* Christoph Lameter <clameter@sgi.com>
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* Generalized, added support for multiple lists and
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* constructors / destructors.
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*/
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#include <linux/kernel.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/quicklist.h>
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DEFINE_PER_CPU(struct quicklist [CONFIG_NR_QUICK], quicklist);
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#define FRACTION_OF_NODE_MEM 16
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static unsigned long max_pages(unsigned long min_pages)
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{
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unsigned long node_free_pages, max;
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int node = numa_node_id();
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struct zone *zones = NODE_DATA(node)->node_zones;
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int num_cpus_on_node;
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node_free_pages =
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#ifdef CONFIG_ZONE_DMA
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zone_page_state(&zones[ZONE_DMA], NR_FREE_PAGES) +
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#endif
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#ifdef CONFIG_ZONE_DMA32
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zone_page_state(&zones[ZONE_DMA32], NR_FREE_PAGES) +
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#endif
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zone_page_state(&zones[ZONE_NORMAL], NR_FREE_PAGES);
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max = node_free_pages / FRACTION_OF_NODE_MEM;
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num_cpus_on_node = cpumask_weight(cpumask_of_node(node));
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max /= num_cpus_on_node;
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return max(max, min_pages);
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}
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static long min_pages_to_free(struct quicklist *q,
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unsigned long min_pages, long max_free)
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{
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long pages_to_free;
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pages_to_free = q->nr_pages - max_pages(min_pages);
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return min(pages_to_free, max_free);
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}
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/*
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* Trim down the number of pages in the quicklist
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*/
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void quicklist_trim(int nr, void (*dtor)(void *),
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unsigned long min_pages, unsigned long max_free)
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{
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long pages_to_free;
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struct quicklist *q;
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q = &get_cpu_var(quicklist)[nr];
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if (q->nr_pages > min_pages) {
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pages_to_free = min_pages_to_free(q, min_pages, max_free);
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while (pages_to_free > 0) {
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/*
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* We pass a gfp_t of 0 to quicklist_alloc here
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* because we will never call into the page allocator.
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*/
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void *p = quicklist_alloc(nr, 0, NULL);
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if (dtor)
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dtor(p);
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free_page((unsigned long)p);
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pages_to_free--;
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}
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}
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put_cpu_var(quicklist);
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}
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unsigned long quicklist_total_size(void)
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{
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unsigned long count = 0;
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int cpu;
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struct quicklist *ql, *q;
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for_each_online_cpu(cpu) {
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ql = per_cpu(quicklist, cpu);
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for (q = ql; q < ql + CONFIG_NR_QUICK; q++)
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count += q->nr_pages;
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}
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return count;
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}
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