From: Liu Yuan <tailai.ly@xxxxxxxxxx>
These functions and data types are based on the percpu
disk stats infrastructure.
Signed-off-by: Liu Yuan <tailai.ly@xxxxxxxxxx>
---
include/linux/genhd.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index c0d5f69..4f0257c 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -86,6 +86,11 @@ struct disk_stats {
unsigned long ticks[2];
unsigned long io_ticks;
unsigned long time_in_queue;
+#ifdef CONFIG_PAGE_CACHE_ACCT
+ unsigned long page_cache_readpages;
+ unsigned long page_cache_hit[2];
+ unsigned long page_cache_missed[2];
+#endif
};
#define PARTITION_META_INFO_VOLNAMELTH 64
@@ -400,6 +405,57 @@ static inline void free_part_info(struct hd_struct *part)
kfree(part->info);
}
+#ifdef CONFIG_PAGE_CACHE_ACCT
+static inline void page_cache_acct_readpages(struct super_block *sb, int nr_pages)
+{
+ struct block_device *bdev = sb->s_bdev;
+ struct hd_struct *part;
+ int cpu;
+ if (likely(bdev) && likely(part = bdev->bd_part)) {
+ cpu = part_stat_lock();
+ part_stat_add(cpu, part, page_cache_readpages, nr_pages);
+ part_stat_unlock();
+ }
+}
+static inline void page_cache_acct_hit(struct super_block *sb, int rw)
+{
+ struct block_device *bdev = sb->s_bdev;
+ struct hd_struct *part;
+ int cpu;
+ if (likely(bdev) && likely(part = bdev->bd_part)) {
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, part, page_cache_hit[rw]);
+ part_stat_unlock();
+ }
+}
+
+static inline void page_cache_acct_missed(struct super_block *sb, int rw)
+{
+ struct block_device *bdev = sb->s_bdev;
+ struct hd_struct *part;
+ int cpu;
+ if (likely(bdev) && likely(part = bdev->bd_part)) {
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, part, page_cache_missed[rw]);
+ part_stat_unlock();
+ }
+}
+
+#else /* !CONFIG_PAGE_CACHE_ACCT */
+static inline void page_cache_acct_readpages(struct super_block *sb, int nr_pages)
+{
+}
+
+static inline void page_cache_acct_hit(struct super_block *sb, int rw)
+{
+}
+
+static inline void page_cache_acct_missed(struct super_block *sb, int rw)
+{
+}
+
+#endif /* CONFIG_PAGE_CACHE_ACCT */
+
/* block/blk-core.c */
extern void part_round_stats(int cpu, struct hd_struct *part);
--
1.7.0.4
--
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