On Tue, 13 Aug 2019 09:04:28 +0800
Xing Zhengjun <zhengjun.x...@linux.intel.com> wrote:
> Hi Steve,
>
> Could you help to review? Thanks.
Thanks for the ping. Yes, I'll take a look at it. I'll be pulling in a
lot of patches that have queued up.
-- Steve
>
> On 7/13/2019 12:05 AM, Tom Zanussi wrote:
> > 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 <zanu...@kernel.org>
> >> Signed-off-by: Zhengjun Xing <zhengjun.x...@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++;
> >> }
> >> }
>
