From 329844d4bc3d5a11f1e63938d66f74c9584c7abc Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Wed, 8 Jun 2016 14:55:33 -0400 Subject: translate-all: add tb hash bucket info to 'info jit' dump MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Examples: - Good hashing, i.e. tb_hash_func5(phys_pc, pc, flags): TB count 715135/2684354 [...] TB hash buckets 388775/524288 (74.15% head buckets used) TB hash occupancy 33.04% avg chain occ. Histogram: [0,10)%|▆ █ ▅▁▃▁▁|[90,100]% TB hash avg chain 1.017 buckets. Histogram: 1|█▁▁|3 - Not-so-good hashing, i.e. tb_hash_func5(phys_pc, pc, 0): TB count 712636/2684354 [...] TB hash buckets 344924/524288 (65.79% head buckets used) TB hash occupancy 31.64% avg chain occ. Histogram: [0,10)%|█ ▆ ▅▁▃▁▂|[90,100]% TB hash avg chain 1.047 buckets. Histogram: 1|█▁▁▁|4 - Bad hashing, i.e. tb_hash_func5(phys_pc, 0, 0): TB count 702818/2684354 [...] TB hash buckets 112741/524288 (21.50% head buckets used) TB hash occupancy 10.15% avg chain occ. Histogram: [0,10)%|█ ▁ ▁▁▁▁▁|[90,100]% TB hash avg chain 2.107 buckets. Histogram: [1.0,10.2)|█▁▁▁▁▁▁▁▁▁|[83.8,93.0] - Good hashing, but no auto-resize: TB count 715634/2684354 TB hash buckets 8192/8192 (100.00% head buckets used) TB hash occupancy 98.30% avg chain occ. Histogram: [95.3,95.8)%|▁▁▃▄▃▄▁▇▁█|[99.5,100.0]% TB hash avg chain 22.070 buckets. Histogram: [15.0,16.7)|▁▂▅▄█▅▁▁▁▁|[30.3,32.0] Acked-by: Sergey Fedorov Suggested-by: Richard Henderson Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Message-Id: <1465412133-3029-16-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson --- translate-all.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'translate-all.c') diff --git a/translate-all.c b/translate-all.c index b620fccfc2..e8b88b4485 100644 --- a/translate-all.c +++ b/translate-all.c @@ -1668,6 +1668,10 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) int i, target_code_size, max_target_code_size; int direct_jmp_count, direct_jmp2_count, cross_page; TranslationBlock *tb; + struct qht_stats hst; + uint32_t hgram_opts; + size_t hgram_bins; + char *hgram; target_code_size = 0; max_target_code_size = 0; @@ -1718,6 +1722,38 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) direct_jmp2_count, tcg_ctx.tb_ctx.nb_tbs ? (direct_jmp2_count * 100) / tcg_ctx.tb_ctx.nb_tbs : 0); + + qht_statistics_init(&tcg_ctx.tb_ctx.htable, &hst); + + cpu_fprintf(f, "TB hash buckets %zu/%zu (%0.2f%% head buckets used)\n", + hst.used_head_buckets, hst.head_buckets, + (double)hst.used_head_buckets / hst.head_buckets * 100); + + hgram_opts = QDIST_PR_BORDER | QDIST_PR_LABELS; + hgram_opts |= QDIST_PR_100X | QDIST_PR_PERCENT; + if (qdist_xmax(&hst.occupancy) - qdist_xmin(&hst.occupancy) == 1) { + hgram_opts |= QDIST_PR_NODECIMAL; + } + hgram = qdist_pr(&hst.occupancy, 10, hgram_opts); + cpu_fprintf(f, "TB hash occupancy %0.2f%% avg chain occ. Histogram: %s\n", + qdist_avg(&hst.occupancy) * 100, hgram); + g_free(hgram); + + hgram_opts = QDIST_PR_BORDER | QDIST_PR_LABELS; + hgram_bins = qdist_xmax(&hst.chain) - qdist_xmin(&hst.chain); + if (hgram_bins > 10) { + hgram_bins = 10; + } else { + hgram_bins = 0; + hgram_opts |= QDIST_PR_NODECIMAL | QDIST_PR_NOBINRANGE; + } + hgram = qdist_pr(&hst.chain, hgram_bins, hgram_opts); + cpu_fprintf(f, "TB hash avg chain %0.3f buckets. Histogram: %s\n", + qdist_avg(&hst.chain), hgram); + g_free(hgram); + + qht_statistics_destroy(&hst); + cpu_fprintf(f, "\nStatistics:\n"); cpu_fprintf(f, "TB flush count %d\n", tcg_ctx.tb_ctx.tb_flush_count); cpu_fprintf(f, "TB invalidate count %d\n", -- cgit v1.2.3