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[PULL 24/28] tests/plugins: add instruction matching to libinsn.so
From: |
Alex Bennée |
Subject: |
[PULL 24/28] tests/plugins: add instruction matching to libinsn.so |
Date: |
Wed, 9 Feb 2022 14:15:25 +0000 |
This adds simple instruction matching to the libinsn.so plugin which
is useful for examining the execution distance between instructions.
For example to track how often we flush in ARM due to TLB updates:
-plugin ./tests/plugin/libinsn.so,match=tlbi
which leads to output like this:
0xffffffc01019a918, 'tlbi vale1is, x1', 5702 hits, 31825 match hits, Δ+8112
since last match, 68859 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5703 hits, 56593 match hits,
Δ+17712125 since last match, 33455 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5704 hits, 56594 match hits, Δ+12689
since last match, 33454 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5705 hits, 56595 match hits, Δ+12585
since last match, 33454 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5706 hits, 56596 match hits, Δ+10491
since last match, 33454 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5707 hits, 56597 match hits, Δ+4721
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5708 hits, 56598 match hits, Δ+10733
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5709 hits, 56599 match hits, Δ+61959
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5710 hits, 56600 match hits, Δ+55235
since last match, 33454 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5711 hits, 56601 match hits, Δ+54373
since last match, 33454 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5712 hits, 56602 match hits, Δ+2705
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5713 hits, 56603 match hits, Δ+17262
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5714 hits, 56604 match hits, Δ+17206
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5715 hits, 56605 match hits, Δ+28940
since last match, 33453 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5716 hits, 56606 match hits, Δ+7370
since last match, 33452 avg insns/match
0xffffffc01019a918, 'tlbi vale1is, x1', 5717 hits, 56607 match hits, Δ+7066
since last match, 33452 avg insns/match
showing we do some sort of TLBI invalidation every 33 thousand
instructions.
Cc: Vasilev Oleg <vasilev.oleg@huawei.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Emilio Cota <cota@braap.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220204204335.1689602-25-alex.bennee@linaro.org>
diff --git a/tests/plugin/insn.c b/tests/plugin/insn.c
index d5a0a08cb4..cd5ea5d4ae 100644
--- a/tests/plugin/insn.c
+++ b/tests/plugin/insn.c
@@ -28,9 +28,25 @@ static uint64_t inline_insn_count;
static bool do_inline;
static bool do_size;
-static bool do_frequency;
static GArray *sizes;
+typedef struct {
+ char *match_string;
+ uint64_t hits[MAX_CPUS];
+ uint64_t last_hit[MAX_CPUS];
+ uint64_t total_delta[MAX_CPUS];
+ GPtrArray *history[MAX_CPUS];
+} Match;
+
+static GArray *matches;
+
+typedef struct {
+ Match *match;
+ uint64_t vaddr;
+ uint64_t hits;
+ char *disas;
+} Instruction;
+
static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
{
unsigned int i = cpu_index % MAX_CPUS;
@@ -45,6 +61,37 @@ static void vcpu_insn_exec_before(unsigned int cpu_index,
void *udata)
c->insn_count++;
}
+static void vcpu_insn_matched_exec_before(unsigned int cpu_index, void *udata)
+{
+ unsigned int i = cpu_index % MAX_CPUS;
+ Instruction *insn = (Instruction *) udata;
+ Match *match = insn->match;
+ g_autoptr(GString) ts = g_string_new("");
+
+ insn->hits++;
+ g_string_append_printf(ts, "0x%" PRIx64 ", '%s', %"PRId64 " hits",
+ insn->vaddr, insn->disas, insn->hits);
+
+ uint64_t icount = counts[i].insn_count;
+ uint64_t delta = icount - match->last_hit[i];
+
+ match->hits[i]++;
+ match->total_delta[i] += delta;
+
+ g_string_append_printf(ts,
+ ", %"PRId64" match hits, "
+ "Δ+%"PRId64 " since last match,"
+ " %"PRId64 " avg insns/match\n",
+ match->hits[i], delta,
+ match->total_delta[i] / match->hits[i]);
+
+ match->last_hit[i] = icount;
+
+ qemu_plugin_outs(ts->str);
+
+ g_ptr_array_add(match->history[i], insn);
+}
+
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
@@ -71,6 +118,29 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct
qemu_plugin_tb *tb)
unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
(*cnt)++;
}
+
+ /*
+ * If we are tracking certain instructions we will need more
+ * information about the instruction which we also need to
+ * save if there is a hit.
+ */
+ if (matches) {
+ char *insn_disas = qemu_plugin_insn_disas(insn);
+ int j;
+ for (j = 0; j < matches->len; j++) {
+ Match *m = &g_array_index(matches, Match, j);
+ if (g_str_has_prefix(insn_disas, m->match_string)) {
+ Instruction *rec = g_new0(Instruction, 1);
+ rec->disas = g_strdup(insn_disas);
+ rec->vaddr = qemu_plugin_insn_vaddr(insn);
+ rec->match = m;
+ qemu_plugin_register_vcpu_insn_exec_cb(
+ insn, vcpu_insn_matched_exec_before,
+ QEMU_PLUGIN_CB_NO_REGS, rec);
+ }
+ }
+ g_free(insn_disas);
+ }
}
}
@@ -105,6 +175,21 @@ static void plugin_exit(qemu_plugin_id_t id, void *p)
qemu_plugin_outs(out->str);
}
+
+/* Add a match to the array of matches */
+static void parse_match(char *match)
+{
+ Match new_match = { .match_string = match };
+ int i;
+ for (i = 0; i < MAX_CPUS; i++) {
+ new_match.history[i] = g_ptr_array_new();
+ }
+ if (!matches) {
+ matches = g_array_new(false, true, sizeof(Match));
+ }
+ g_array_append_val(matches, new_match);
+}
+
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
@@ -122,6 +207,8 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t
id,
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
+ } else if (g_strcmp0(tokens[0], "match") == 0) {
+ parse_match(tokens[1]);
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
--
2.30.2
- [PULL 00/28] testing and plugin updates, Alex Bennée, 2022/02/09
- [PULL 22/28] contrib/plugins: add a drcov plugin, Alex Bennée, 2022/02/09
- [PULL 01/28] tests/Makefile.include: clean-up old code, Alex Bennée, 2022/02/09
- [PULL 24/28] tests/plugins: add instruction matching to libinsn.so,
Alex Bennée <=
- [PULL 09/28] tests/lcitool: Refresh submodule and remove libxml2, Alex Bennée, 2022/02/09
- [PULL 14/28] tests/lcitool: Allow lcitool-refresh in out-of-tree builds, too, Alex Bennée, 2022/02/09
- [PULL 23/28] tests/plugin: allow libinsn.so per-CPU counts, Alex Bennée, 2022/02/09
- [PULL 03/28] Makefile: also remove .gcno files when cleaning, Alex Bennée, 2022/02/09
- [PULL 02/28] tests/qtest: enable more vhost-user tests by default, Alex Bennée, 2022/02/09
- [PULL 05/28] MAINTAINERS: Cover lcitool submodule with build test / automation, Alex Bennée, 2022/02/09
- [PULL 07/28] tests/lcitool: Include local qemu.yml when refreshing cirrus-ci files, Alex Bennée, 2022/02/09
- [PULL 04/28] .gitignore: add .gcov pattern, Alex Bennée, 2022/02/09
- [PULL 06/28] gitmodules: Correct libvirt-ci submodule URL, Alex Bennée, 2022/02/09
- [PULL 12/28] docs/devel: mention our .editorconfig, Alex Bennée, 2022/02/09