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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 VMware Inc, Yordan Karadzhov <y.karadz@gmail.com>
*/
// C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// KernelShark
#include "libkshark.h"
#include "libkshark-tepdata.h"
const char *default_file = "trace.dat";
int main(int argc, char **argv)
{
size_t i, sd, n_rows, n_tasks, n_evts, count;
struct kshark_context *kshark_ctx;
struct kshark_data_stream *stream;
struct kshark_entry **data = NULL;
int *pids, *evt_ids;
char *entry_str;
/* Create a new kshark session. */
kshark_ctx = NULL;
if (!kshark_instance(&kshark_ctx))
return 1;
/* Open a trace data file produced by trace-cmd. */
if (argc > 1)
sd = kshark_open(kshark_ctx, argv[1]);
else
sd = kshark_open(kshark_ctx, default_file);
if (sd < 0) {
kshark_free(kshark_ctx);
return 1;
}
/* Load the content of the file into an array of entries. */
n_rows = kshark_load_entries(kshark_ctx, sd, &data);
/* Filter the trace data coming from trace-cmd. */
n_tasks = kshark_get_task_pids(kshark_ctx, sd, &pids);
stream = kshark_get_data_stream(kshark_ctx, sd);
for (i = 0; i < n_tasks; ++i) {
char *task_str =
kshark_comm_from_pid(sd, pids[i]);
if (strcmp(task_str, "trace-cmd") == 0)
kshark_filter_add_id(kshark_ctx, sd,
KS_HIDE_TASK_FILTER,
pids[i]);
free(task_str);
}
free(pids);
/*
* Set the Filter Mask. In this case we want to avoid showing the
* filterd entris in text format.
*/
kshark_ctx->filter_mask = KS_TEXT_VIEW_FILTER_MASK;
kshark_ctx->filter_mask |= KS_EVENT_VIEW_FILTER_MASK;
kshark_filter_stream_entries(kshark_ctx, sd, data, n_rows);
/* Print to the screen the first 10 visible entries. */
count = 0;
i = 0;
for (i = 0; i < n_rows; ++i) {
if (data[i]->visible & KS_TEXT_VIEW_FILTER_MASK) {
entry_str = kshark_dump_entry(data[i]);
puts(entry_str);
free(entry_str);
if (++count > 10)
break;
}
++i;
}
puts("\n\n");
/* Show only "sched" events. */
n_evts = stream->n_events;
evt_ids = kshark_get_all_event_ids(kshark_ctx->stream[sd]);
for (i = 0; i < n_evts; ++i) {
char *event_str =
kshark_event_from_id(sd, evt_ids[i]);
if (strstr(event_str, "sched/"))
kshark_filter_add_id(kshark_ctx, sd,
KS_SHOW_EVENT_FILTER,
evt_ids[i]);
free(event_str);
}
kshark_filter_stream_entries(kshark_ctx, sd, data, n_rows);
/* Print to the screen the first 10 visible entries. */
count = 0;
i = 0;
for (i = 0; i < n_rows; ++i) {
if (data[i]->visible & KS_TEXT_VIEW_FILTER_MASK) {
entry_str = kshark_dump_entry(data[i]);
puts(entry_str);
free(entry_str);
if (++count > 10)
break;
}
++i;
}
puts("\n\n");
/* Clear all filters. */
kshark_filter_clear(kshark_ctx, sd, KS_HIDE_TASK_FILTER);
kshark_filter_clear(kshark_ctx, sd, KS_SHOW_EVENT_FILTER);
/* Use the Advanced filter to do event content based filtering. */
kshark_tep_add_filter_str(stream, "sched/sched_wakeup:target_cpu>1");
/* The Advanced filter requires reloading the data. */
for (i = 0; i < n_rows; ++i)
free(data[i]);
n_rows = kshark_load_entries(kshark_ctx, sd, &data);
count = 0;
for (i = 0; i < n_rows; ++i) {
if (data[i]->visible & KS_EVENT_VIEW_FILTER_MASK) {
entry_str = kshark_dump_entry(data[i]);
puts(entry_str);
free(entry_str);
if (++count > 10)
break;
}
}
/* Free the memory. */
for (i = 0; i < n_rows; ++i)
free(data[i]);
free(data);
/* Close the file. */
kshark_close(kshark_ctx, sd);
/* Close the session. */
kshark_free(kshark_ctx);
return 0;
}
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