Add the most basic cache statistics (pages hit and missed). Note that
the hit rate is not printed if cache was not used to avoid division
by zero.
Signed-off-by: Petr Tesarik <ptesarik at suse.cz>
---
makedumpfile.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/makedumpfile.c b/makedumpfile.c
index c62d035..d778139 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -39,6 +39,10 @@ struct SplitBlock *splitblock = NULL;
char filename_stdout[] = FILENAME_STDOUT;
+/* Cache statistics */
+static unsigned long long cache_hit;
+static unsigned long long cache_miss;
+
static void first_cycle(mdf_pfn_t start, mdf_pfn_t max, struct cycle *cycle)
{
cycle->start_pfn = round(start, info->pfn_cyclic);
@@ -645,6 +649,7 @@ next_page:
pgaddr = PAGEBASE(paddr);
pgbuf = cache_search(pgaddr);
if (!pgbuf) {
+ ++cache_miss;
cached = cache_alloc(pgaddr);
if (!cached)
goto error;
@@ -661,7 +666,8 @@ next_page:
goto error_cached;
}
cache_add(cached);
- }
+ } else
+ ++cache_hit;
memcpy(bufptr, pgbuf + PAGEOFFSET(paddr), read_size);
@@ -8294,6 +8300,11 @@ print_report(void)
REPORT_MSG("--------------------------------------------------\n");
REPORT_MSG("Total pages : 0x%016llx\n", info->max_mapnr);
REPORT_MSG("\n");
+ REPORT_MSG("Cache hit: %lld, miss: %lld", cache_hit, cache_miss);
+ if (cache_hit + cache_miss)
+ REPORT_MSG(", hit rate: %.1f%%",
+ 100.0 * cache_hit / (cache_hit + cache_miss));
+ REPORT_MSG("\n\n");
}
static void
--
1.8.4.5
