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SubjectRe: [PATCH v3] trace:Add "gfp_t" support in synthetic_events
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Hi Zhengjun,

On Fri, 2019-07-12 at 09:53 +0800, Zhengjun Xing wrote:
> Add "gfp_t" support in synthetic_events, then the "gfp_t" type
> parameter in some functions can be traced.
>
> Prints the gfp flags as hex in addition to the human-readable flag
> string. Example output:
>
> whoopsie-630 [000] ...1 78.969452: testevent: bar=b20
> (GFP_ATOMIC|__GFP_ZERO)
> rcuc/0-11 [000] ...1 81.097555: testevent: bar=a20 (GFP_ATOMIC)
> rcuc/0-11 [000] ...1 81.583123: testevent: bar=a20 (GFP_ATOMIC)
>
> Signed-off-by: Tom Zanussi <zanussi@kernel.org>
> Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>

Looks good to me, thanks!

Tom

> ---
> kernel/trace/trace_events_hist.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/kernel/trace/trace_events_hist.c
> b/kernel/trace/trace_events_hist.c
> index ca6b0dff60c5..30f0f32aca62 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -13,6 +13,10 @@
> #include <linux/rculist.h>
> #include <linux/tracefs.h>
>
> +/* for gfp flag names */
> +#include <linux/trace_events.h>
> +#include <trace/events/mmflags.h>
> +
> #include "tracing_map.h"
> #include "trace.h"
> #include "trace_dynevent.h"
> @@ -752,6 +756,8 @@ static int synth_field_size(char *type)
> size = sizeof(unsigned long);
> else if (strcmp(type, "pid_t") == 0)
> size = sizeof(pid_t);
> + else if (strcmp(type, "gfp_t") == 0)
> + size = sizeof(gfp_t);
> else if (synth_field_is_string(type))
> size = synth_field_string_size(type);
>
> @@ -792,6 +798,8 @@ static const char *synth_field_fmt(char *type)
> fmt = "%lu";
> else if (strcmp(type, "pid_t") == 0)
> fmt = "%d";
> + else if (strcmp(type, "gfp_t") == 0)
> + fmt = "%x";
> else if (synth_field_is_string(type))
> fmt = "%s";
>
> @@ -834,9 +842,20 @@ static enum print_line_t
> print_synth_event(struct trace_iterator *iter,
> i == se->n_fields - 1 ? ""
> : " ");
> n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
> } else {
> + struct trace_print_flags __flags[] = {
> + __def_gfpflag_names, {-1, NULL} };
> +
> trace_seq_printf(s, print_fmt, se-
> >fields[i]->name,
> entry->fields[n_u64],
> i == se->n_fields - 1 ? ""
> : " ");
> +
> + if (strcmp(se->fields[i]->type, "gfp_t") ==
> 0) {
> + trace_seq_puts(s, " (");
> + trace_print_flags_seq(s, "|",
> + entry-
> >fields[n_u64],
> + __flags);
> + trace_seq_putc(s, ')');
> + }
> n_u64++;
> }
> }

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