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 <[email protected]> --- 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 _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
