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Date: Tue, 16 Dec 2014 18:44:49 -0200
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: Stephane Eranian <eranian@...gle.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
ak@...ux.intel.com, jolsa@...hat.com, dsahern@...il.com,
dzickus@...hat.com, namhyung@...nel.org, jmario@...hat.com,
rfowles@...hat.com
Subject: Re: [PATCH] perf mem: enable simultaneous sampling of loads/stores
Em Tue, Dec 16, 2014 at 05:53:58PM +0100, Stephane Eranian escreveu:
>
> This patch modifies perf mem to default to sampling loads
> and stores simultaneously. It could only do one or the other
> before yet there was not hardware restriction preventing
> simultaneous collection. With this patch, one run is sufficient
> to collect both.
>
> By default load/stores are sampled now:
> $ perf mem rec
> $ perf mem rep
>
> It is still possible to sample only loads or stores by using the
> -t option:
> $ perf mem -t load rec
> $ perf mem -t load rep
> Or
> $ perf mem -t store rec
> $ perf mem -t store rep
>
> The perf report TUI will show one event at a time. The store
> output will contain a Weight column which will be empty.
Can you please update the man page and resubmit?
Are those unchecked strdups really needed?
- Arnaldo
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
> tools/perf/builtin-mem.c | 107 ++++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 92 insertions(+), 15 deletions(-)
>
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 24db6ff..52dbaae 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -7,10 +7,13 @@
> #include "util/session.h"
> #include "util/data.h"
>
> -#define MEM_OPERATION_LOAD "load"
> -#define MEM_OPERATION_STORE "store"
> +#define MEM_OPERATION_LOAD 0x1
> +#define MEM_OPERATION_STORE 0x2
>
> -static const char *mem_operation = MEM_OPERATION_LOAD;
> +/*
> + * default to both load an store sampling
> + */
> +static int mem_operation = MEM_OPERATION_LOAD | MEM_OPERATION_STORE;
>
> struct perf_mem {
> struct perf_tool tool;
> @@ -25,26 +28,30 @@ static int __cmd_record(int argc, const char **argv)
> {
> int rec_argc, i = 0, j;
> const char **rec_argv;
> - char event[64];
> int ret;
>
> - rec_argc = argc + 4;
> + rec_argc = argc + 7; /* max number of arguments */
> rec_argv = calloc(rec_argc + 1, sizeof(char *));
> if (!rec_argv)
> return -1;
>
> rec_argv[i++] = strdup("record");
> - if (!strcmp(mem_operation, MEM_OPERATION_LOAD))
> +
> + if (mem_operation & MEM_OPERATION_LOAD)
> rec_argv[i++] = strdup("-W");
> +
> rec_argv[i++] = strdup("-d");
> - rec_argv[i++] = strdup("-e");
>
> - if (strcmp(mem_operation, MEM_OPERATION_LOAD))
> - sprintf(event, "cpu/mem-stores/pp");
> - else
> - sprintf(event, "cpu/mem-loads/pp");
> + if (mem_operation & MEM_OPERATION_LOAD) {
> + rec_argv[i++] = strdup("-e");
> + rec_argv[i++] = strdup("cpu/mem-loads/pp");
> + }
> +
> + if (mem_operation & MEM_OPERATION_STORE) {
> + rec_argv[i++] = strdup("-e");
> + rec_argv[i++] = strdup("cpu/mem-stores/pp");
> + }
>
> - rec_argv[i++] = strdup(event);
> for (j = 1; j < argc; j++, i++)
> rec_argv[i] = argv[j];
>
> @@ -170,7 +177,7 @@ static int report_events(int argc, const char **argv, struct perf_mem *mem)
> * there is no weight (cost) associated with stores, so don't print
> * the column
> */
> - if (strcmp(mem_operation, MEM_OPERATION_LOAD))
> + if (!(mem_operation & MEM_OPERATION_LOAD))
> rep_argv[i++] = strdup("--sort=mem,sym,dso,symbol_daddr,"
> "dso_daddr,tlb,locked");
>
> @@ -182,6 +189,75 @@ static int report_events(int argc, const char **argv, struct perf_mem *mem)
> return ret;
> }
>
> +struct mem_mode {
> + const char *name;
> + int mode;
> +};
> +
> +#define MEM_OPT(n, m) \
> + { .name = n, .mode = (m) }
> +
> +#define MEM_END { .name = NULL }
> +
> +static const struct mem_mode mem_modes[]={
> + MEM_OPT("load", MEM_OPERATION_LOAD),
> + MEM_OPT("store", MEM_OPERATION_STORE),
> + MEM_END
> +};
> +
> +static int
> +parse_mem_ops(const struct option *opt, const char *str, int unset)
> +{
> + int *mode = (int *)opt->value;
> + const struct mem_mode *m;
> + char *s, *os = NULL, *p;
> + int ret = -1;
> +
> + if (unset)
> + return 0;
> +
> + /* str may be NULL in case no arg is passed to -t */
> + if (str) {
> + /* because str is read-only */
> + s = os = strdup(str);
> + if (!s)
> + return -1;
> +
> + /* reset mode */
> + *mode = 0;
> +
> + for (;;) {
> + p = strchr(s, ',');
> + if (p)
> + *p = '\0';
> +
> + for (m = mem_modes; m->name; m++) {
> + if (!strcasecmp(s, m->name))
> + break;
> + }
> + if (!m->name) {
> + fprintf(stderr, "unknown sampling op %s,"
> + " check man page\n", s);
> + goto error;
> + }
> +
> + *mode |= m->mode;
> +
> + if (!p)
> + break;
> +
> + s = p + 1;
> + }
> + }
> + ret = 0;
> +
> + if (*mode == 0)
> + *mode = MEM_OPERATION_LOAD;
> +error:
> + free(os);
> + return ret;
> +}
> +
> int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
> {
> struct stat st;
> @@ -199,8 +275,9 @@ int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
> .input_name = "perf.data",
> };
> const struct option mem_options[] = {
> - OPT_STRING('t', "type", &mem_operation,
> - "type", "memory operations(load/store)"),
> + OPT_CALLBACK('t', "type", &mem_operation,
> + "type", "memory operations(load,store) Default load,store",
> + parse_mem_ops),
> OPT_BOOLEAN('D', "dump-raw-samples", &mem.dump_raw,
> "dump raw samples in ASCII"),
> OPT_BOOLEAN('U', "hide-unresolved", &mem.hide_unresolved,
> --
> 1.9.1
--
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