Messages in this thread | | | Subject | Re: [PATCH v3] trace:Add "gfp_t" support in synthetic_events | From | Xing Zhengjun <> | Date | Tue, 13 Aug 2019 09:04:28 +0800 |
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Hi Steve,
Could you help to review? Thanks.
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 <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++; >> } >> }
-- Zhengjun Xing
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