From 22caef07f89d1291ae8b297c60d47bdc1193644d Mon Sep 17 00:00:00 2001
From: Timo Kokkonen <kaapeli@itanic.dy.fi>
Date: Sun, 29 Aug 2010 13:29:30 +0300
Subject: [PATCH] pagemap.h: Implement kpageflag handling code

This code is needed for convenient kpageflag handling.

Signed-off-by: Timo Kokkonen <kaapeli@itanic.dy.fi>
---
 analyze.c | 25 +++++++++++++++++++++++++
 pagemap.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/analyze.c b/analyze.c
index fb66dcf..1625a24 100644
--- a/analyze.c
+++ b/analyze.c
@@ -5,6 +5,31 @@
 #include "utils.h"
 #include "bintree.h"
 
+struct kpageflag_str kpageflag_str[] = {
+	{ .flag = LOCKED,		.str = "locked", },
+	{ .flag = ERROR,		.str = "error", },
+	{ .flag = REFERENCED,		.str = "referenced", },
+	{ .flag = UPTODATE,		.str = "uptodate", },
+	{ .flag = DIRTY,		.str = "dirty", },
+	{ .flag = LRU,			.str = "lru", },
+	{ .flag = ACTIVE,		.str = "active", },
+	{ .flag = SLAB,			.str = "slab", },
+	{ .flag = WRITEBACK,		.str = "writeback", },
+	{ .flag = RECLAIM,		.str = "reclaim", },
+	{ .flag = BUDDY,		.str = "buddy", },
+	{ .flag = MMAP,			.str = "mmap", },
+	{ .flag = ANON,			.str = "anon", },
+	{ .flag = SWAPCACHE,		.str = "swapcache", },
+	{ .flag = SWAPBACKED,		.str = "swapbacked", },
+	{ .flag = COMPOUND_HEAD,	.str = "compound_head", },
+	{ .flag = COMPOUND_TAIL,	.str = "compound_tail", },
+	{ .flag = HUGE,			.str = "huge", },
+	{ .flag = UNEVICTABLE,		.str = "unevictable", },
+	{ .flag = HWPOISON,		.str = "hwpoison", },
+	{ .flag = NOPAGE,		.str = "nopage", },
+	{ .flag = KSM,			.str = "ksm", },
+};
+
 #define SI_k	1024ll
 #define SI_M	(SI_k * SI_k)
 #define SI_G	(SI_M * SI_k)
diff --git a/pagemap.h b/pagemap.h
index ffc55ef..34c5d94 100644
--- a/pagemap.h
+++ b/pagemap.h
@@ -71,6 +71,56 @@ static inline int swap_offset(struct pageframe *p)
 	return (BITRANGE(5, 54) & p->pf) >> 5;
 }
 
+#define KPAGEFLAGS_NUM 22
+
+enum kpageflags {
+	LOCKED,
+	ERROR,
+	REFERENCED,
+	UPTODATE,
+	DIRTY,
+	LRU,
+	ACTIVE,
+	SLAB,
+	WRITEBACK,
+	RECLAIM,
+	BUDDY,
+	MMAP,
+	ANON,
+	SWAPCACHE,
+	SWAPBACKED,
+	COMPOUND_HEAD,
+	COMPOUND_TAIL,
+	HUGE,
+	UNEVICTABLE,
+	HWPOISON,
+	NOPAGE,
+	KSM,
+};
+
+struct kpageflag_str {
+	int flag;
+	char *str;
+};
+
+extern struct kpageflag_str kpageflag_str[];
+
+static inline int kpageflag_is_set(struct pageframe *p, int flag)
+{
+	return !!(BITRANGE(flag, flag) & p->kpageflags);
+}
+
+static inline char *kpageflag_to_str(int flag)
+{
+	int i;
+
+	for (i = 0; i < KPAGEFLAGS_NUM; i++)
+		if (kpageflag_str[i].flag == flag)
+			return kpageflag_str[i].str;
+
+	return NULL;
+}
+
 struct maps {
 	struct list_head list;
 
-- 
2.45.0