From: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Subject: [PATCH v2] proc: add /proc/kpagetype interface
This makes page pageblock type information available to the user-space.
Cc: Matt Mackall <mpm@xxxxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
v2:
- fix the "no pageblock migratetype available" case defaulting to
MIGRATE_UNMOVABLE
- fix MIGRATE_ISOLATE and MIGRATE_CMA handling
fs/proc/page.c | 80 ++++++++++++++++++++++++++
include/linux/kernel-pageblock-migratetypes.h | 12 +++
2 files changed, 92 insertions(+)
Index: b/fs/proc/page.c
===================================================================
--- a/fs/proc/page.c 2012-06-04 18:25:54.081310797 +0200
+++ b/fs/proc/page.c 2012-06-04 18:32:39.409310913 +0200
@@ -9,6 +9,7 @@
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <linux/kernel-page-flags.h>
+#include <linux/kernel-pageblock-migratetypes.h>
#include <asm/uaccess.h>
#include "internal.h"
@@ -254,11 +255,90 @@ static const struct file_operations proc
.read = kpageorder_read,
};
+static u64 stable_pageblock_migratetypes(struct page *page)
+{
+ int mt = get_pageblock_migratetype(page);
+ u64 u = 0;
+
+ switch (mt) {
+ case MIGRATE_UNMOVABLE:
+ u = KPM_UNMOVABLE;
+ break;
+ case MIGRATE_RECLAIMABLE:
+ u = KPM_RECLAIMABLE;
+ break;
+ case MIGRATE_MOVABLE:
+ u = KPM_MOVABLE;
+ break;
+ case MIGRATE_PCPTYPES:
+ u = KPM_PCPTYPES;
+ break;
+ case MIGRATE_ISOLATE:
+ u = KPM_ISOLATE;
+ break;
+#ifdef CONFIG_CMA
+ case MIGRATE_CMA:
+ u = KPM_CMA;
+ break;
+#endif
+ }
+
+ return u;
+}
+
+static ssize_t kpagetype_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 ptype;
+
+ pfn = src / KPMSIZE;
+ count = min_t(unsigned long, count,
+ ((ARCH_PFN_OFFSET + 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)
+ ptype = 0;
+ else
+ ptype = stable_pageblock_migratetypes(ppage);
+
+ if (put_user(ptype, out)) {
+ ret = -EFAULT;
+ break;
+ }
+
+ pfn++;
+ out++;
+ count -= KPMSIZE;
+ }
+
+ *ppos += (char __user *)out - buf;
+ if (!ret)
+ ret = (char __user *)out - buf;
+ return ret;
+}
+
+static const struct file_operations proc_kpagetype_operations = {
+ .llseek = mem_lseek,
+ .read = kpagetype_read,
+};
+
static int __init proc_page_init(void)
{
proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
proc_create("kpageorder", S_IRUSR, NULL, &proc_kpageorder_operations);
+ proc_create("kpagetype", S_IRUSR, NULL, &proc_kpagetype_operations);
return 0;
}
module_init(proc_page_init);
Index: b/include/linux/kernel-pageblock-migratetypes.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ b/include/linux/kernel-pageblock-migratetypes.h 2012-06-04 18:33:49.001310951 +0200
@@ -0,0 +1,12 @@
+#ifndef LINUX_KERNEL_PAGEBLOCK_MIGRATETYPES_H
+#define LINUX_KERNEL_PAGEBLOCK_MIGRATETYPES_H
+
+#define KPM_UNMOVABLE 1
+#define KPM_RECLAIMABLE 2
+#define KPM_MOVABLE 3
+#define KPM_PCPTYPES 4
+#define KPM_RESERVE KPM_PCPTYPES
+#define KPM_ISOLATE 5
+#define KPM_CMA 6
+
+#endif /* LINUX_KERNEL_PAGEBLOCK_MIGRATETYPES_H */
--
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