LU-13669 llite: try to improve mmap performance

[fs/lustre-release.git] / lustre / llite / llite_internal.h

diff --git a/lustre/llite/llite_internal.h b/lustre/llite/llite_internal.h
index a0e3036..1a061b0 100644 (file)
--- a/lustre/llite/llite_internal.h
+++ b/lustre/llite/llite_internal.h
@@ -518,6 +518,12 @@ static inline struct pcc_inode *ll_i2pcci(struct inode *inode)
 /* default read-ahead full files smaller than limit on the second read */
 #define SBI_DEFAULT_READ_AHEAD_WHOLE_MAX       MiB_TO_PAGES(2UL)
 
+/* default range pages */
+#define SBI_DEFAULT_RA_RANGE_PAGES             MiB_TO_PAGES(1ULL)
+
+/* Min range pages */
+#define RA_MIN_MMAP_RANGE_PAGES                        16UL
+
 enum ra_stat {
         RA_STAT_HIT = 0,
         RA_STAT_MISS,
@@ -534,6 +540,7 @@ enum ra_stat {
        RA_STAT_FAILED_REACH_END,
        RA_STAT_ASYNC,
        RA_STAT_FAILED_FAST_READ,
+       RA_STAT_MMAP_RANGE_READ,
        _NR_RA_STAT,
 };
 
@@ -541,6 +548,7 @@ struct ll_ra_info {
        atomic_t        ra_cur_pages;
        unsigned long   ra_max_pages;
        unsigned long   ra_max_pages_per_file;
+       unsigned long   ra_range_pages;
        unsigned long   ra_max_read_ahead_whole_pages;
        struct workqueue_struct  *ll_readahead_wq;
        /*
@@ -810,6 +818,16 @@ struct ll_readahead_state {
          */
        pgoff_t         ras_window_start_idx;
        pgoff_t         ras_window_pages;
+
+       /* Page index where min range read starts */
+       pgoff_t         ras_range_min_start_idx;
+       /* Page index where mmap range read ends */
+       pgoff_t         ras_range_max_end_idx;
+       /* number of mmap pages where last time detected */
+       pgoff_t         ras_last_range_pages;
+       /* number of mmap range requests */
+       pgoff_t         ras_range_requests;
+
        /*
         * Optimal RPC size in pages.
         * It decides how many pages will be sent for each read-ahead.