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Quicklists can consume several GB of memory. We should provide a means of monitoring this. After this patch is applied, /proc/meminfo will output the following: % cat /proc/meminfo MemTotal: 7715392 kB MemFree: 5401600 kB Buffers: 80384 kB Cached: 300800 kB SwapCached: 0 kB Active: 235584 kB Inactive: 262656 kB SwapTotal: 2031488 kB SwapFree: 2031488 kB Dirty: 3520 kB Writeback: 0 kB AnonPages: 117696 kB Mapped: 38528 kB Slab: 1589952 kB SReclaimable: 23104 kB SUnreclaim: 1566848 kB PageTables: 14656 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 5889152 kB Committed_AS: 393152 kB VmallocTotal: 17592177655808 kB VmallocUsed: 29056 kB VmallocChunk: 17592177626432 kB Quicklists: 130944 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 262144 kB Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Keiichiro Tokunaga <tokunaga.keiich@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
#ifndef LINUX_QUICKLIST_H
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#define LINUX_QUICKLIST_H
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/*
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* Fast allocations and disposal of pages. Pages must be in the condition
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* as needed after allocation when they are freed. Per cpu lists of pages
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* are kept that only contain node local pages.
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*
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* (C) 2007, SGI. Christoph Lameter <clameter@sgi.com>
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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/percpu.h>
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#ifdef CONFIG_QUICKLIST
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struct quicklist {
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void *page;
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int nr_pages;
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};
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DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
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/*
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* The two key functions quicklist_alloc and quicklist_free are inline so
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* that they may be custom compiled for the platform.
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* Specifying a NULL ctor can remove constructor support. Specifying
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* a constant quicklist allows the determination of the exact address
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* in the per cpu area.
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*
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* The fast patch in quicklist_alloc touched only a per cpu cacheline and
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* the first cacheline of the page itself. There is minmal overhead involved.
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*/
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static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
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{
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struct quicklist *q;
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void **p = NULL;
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q =&get_cpu_var(quicklist)[nr];
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p = q->page;
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if (likely(p)) {
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q->page = p[0];
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p[0] = NULL;
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q->nr_pages--;
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}
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put_cpu_var(quicklist);
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if (likely(p))
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return p;
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p = (void *)__get_free_page(flags | __GFP_ZERO);
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if (ctor && p)
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ctor(p);
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return p;
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}
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static inline void __quicklist_free(int nr, void (*dtor)(void *), void *p,
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struct page *page)
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{
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struct quicklist *q;
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q = &get_cpu_var(quicklist)[nr];
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*(void **)p = q->page;
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q->page = p;
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q->nr_pages++;
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put_cpu_var(quicklist);
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}
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static inline void quicklist_free(int nr, void (*dtor)(void *), void *pp)
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{
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__quicklist_free(nr, dtor, pp, virt_to_page(pp));
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}
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static inline void quicklist_free_page(int nr, void (*dtor)(void *),
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struct page *page)
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{
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__quicklist_free(nr, dtor, page_address(page), page);
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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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unsigned long quicklist_total_size(void);
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#else
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static inline unsigned long quicklist_total_size(void)
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{
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return 0;
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}
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#endif
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#endif /* LINUX_QUICKLIST_H */
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