https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 0d4cbb5e7f60b2f1a4d8b7f6ea4cc264262c7a01 authored by Linus Torvalds on 11 September 2007, 02:49:55 UTC
Linux 2.6.23-rc6
Linux 2.6.23-rc6
Tip revision: 0d4cbb5
quicklist.c
/*
* 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 <clameter@sgi.com>
* Generalized, added support for multiple lists and
* constructors / destructors.
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <linux/quicklist.h>
DEFINE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
#define FRACTION_OF_NODE_MEM 16
static unsigned long max_pages(unsigned long min_pages)
{
unsigned long node_free_pages, max;
node_free_pages = node_page_state(numa_node_id(),
NR_FREE_PAGES);
max = node_free_pages / FRACTION_OF_NODE_MEM;
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;
}