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authorBjorn Helgaas <bhelgaas@google.com>2017-07-04 12:00:58 -0400
committerBjorn Helgaas <bhelgaas@google.com>2017-07-04 12:00:58 -0400
commit66a63e15bf7482c1de5cc906cbc473943ed8e898 (patch)
treee47d70839da3458a572bd7d5c2195117f2983daa /tools/perf/scripts/python/sched-migration.py
parentbec36cfa7bd43a1e4484b14ff6144855f3446c4c (diff)
parentbf44167f37a12bd353ed10fa706691d3f6e4b1a0 (diff)
Merge branch 'pci/host-rcar' into next
* pci/host-rcar: PCI: rcar-gen2: Make of_device_ids const PCI: rcar: Use proper name for the R-Car SoC
Diffstat (limited to 'tools/perf/scripts/python/sched-migration.py')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-03 09:57:22 -0400
itter Alexey Dobriyan <adobriyan@gmail.com> 2008-10-23 10:48:31 -0400 proc: move pagecount stuff to fs/proc/page.c' href='/cgit/cgit.cgi/litmus-rt-tegra.git/commit/fs/proc/page.c?id=6d80e53f0056178c63fa8fbf3e8de40fb4df5f50'>6d80e53f005 
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#include <linux/bootmem.h>
#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/ksm.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <asm/uaccess.h>
#include "internal.h"

#define KPMSIZE sizeof(u64)
#define KPMMASK (KPMSIZE - 1)

/* /proc/kpagecount - an array exposing page counts
 *
 * Each entry is a u64 representing the corresponding
 * physical page count.
 */
static ssize_t kpagecount_read(struct file *file, char __user *buf,
			     size_t count, loff_t *ppos)
{
	u64 __user *out = (u64 __user *)buf;
	struct page *ppage;
	unsigned long src = *ppos;
	unsigned long pfn;
	ssize_t ret = 0;
	u64 pcount;

	pfn = src / KPMSIZE;
	count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
	if (src & KPMMASK || count & KPMMASK)
		return -EINVAL;

	while (count > 0) {
		if (pfn_valid(pfn))
			ppage = pfn_to_page(pfn);
		else
			ppage = NULL;
		if (!ppage)
			pcount = 0;
		else
			pcount = page_mapcount(ppage);

		if (put_user(pcount, out)) {
			ret = -EFAULT;
			break;
		}

		pfn++;
		out++;
		count -= KPMSIZE;
	}