On Wed, 11 Jul 2018 16:38:11 +0300
"Yordan Karadzhov (VMware)" <y.karadz@xxxxxxxxx> wrote:
> This patch introduces a basic example, showing how to initialize the
> Visualization model and to use the API to perform some of the basic
> operations.
>
> Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
> ---
> kernel-shark-qt/examples/CMakeLists.txt | 4 +
> kernel-shark-qt/examples/datahisto.c | 155 ++++++++++++++++++++++++
> 2 files changed, 159 insertions(+)
> create mode 100644 kernel-shark-qt/examples/datahisto.c
>
> diff --git a/kernel-shark-qt/examples/CMakeLists.txt b/kernel-shark-qt/examples/CMakeLists.txt
> index 009fd1e..6906eba 100644
> --- a/kernel-shark-qt/examples/CMakeLists.txt
> +++ b/kernel-shark-qt/examples/CMakeLists.txt
> @@ -7,3 +7,7 @@ target_link_libraries(dload kshark)
> message(STATUS "datafilter")
> add_executable(dfilter datafilter.c)
> target_link_libraries(dfilter kshark)
> +
> +message(STATUS "datahisto")
> +add_executable(dhisto datahisto.c)
> +target_link_libraries(dhisto kshark)
> diff --git a/kernel-shark-qt/examples/datahisto.c b/kernel-shark-qt/examples/datahisto.c
> new file mode 100644
> index 0000000..1db2b02
> --- /dev/null
> +++ b/kernel-shark-qt/examples/datahisto.c
> @@ -0,0 +1,155 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * Copyright (C) 2018 VMware Inc, Yordan Karadzhov <y.karadz@xxxxxxxxx>
> + */
> +
> +// C
> +#include <stdio.h>
> +#include <stdlib.h>
> +
> +// KernelShark
> +#include "libkshark.h"
> +#include "libkshark-model.h"
> +
> +#define N_BINS 5
> +
> +const char *default_file = "trace.dat";
> +
> +void dump_bin(struct kshark_trace_histo *histo, int bin,
> + const char *type, int val)
> +{
> + const struct kshark_entry *e_front, *e_back;
> + char *entry_str;
> + ssize_t i_front, i_back;
> +
> + printf("bin %i {\n", bin);
> + if (strcmp(type, "cpu") == 0) {
> + e_front = ksmodel_get_entry_front(histo, bin, true,
> + kshark_check_cpu, val,
> + &i_front);
> +
> + e_back = ksmodel_get_entry_back(histo, bin, true,
> + kshark_check_cpu, val,
> + &i_back);
> + } else if (strcmp(type, "task") == 0) {
> + e_front = ksmodel_get_entry_front(histo, bin, true,
> + kshark_check_pid, val,
> + &i_front);
> +
> + e_back = ksmodel_get_entry_back(histo, bin, true,
> + kshark_check_pid, val,
Yeah, I think we need to rename the functions to:
kshark_match_cpu() and kshark_match_pid()
> + &i_back);
> + } else {
> + i_front = ksmodel_first_index_at_bin(histo, bin);
> + e_front = histo->data[i_front];
> +
> + i_back = ksmodel_last_index_at_bin(histo, bin);
> + e_back = histo->data[i_back];
> + }
> +
> + if (i_front == KS_EMPTY_BIN) {
> + puts ("EMPTY BIN");
> + } else {
> + entry_str = kshark_dump_entry(e_front);
> + printf("%li -> %s\n", i_front, entry_str);
> + free(entry_str);
> +
> + entry_str = kshark_dump_entry(e_back);
> + printf("%li -> %s\n", i_back, entry_str);
> + free(entry_str);
> + }
> +
> + puts("}\n");
> +}
> +
> +void dump_histo(struct kshark_trace_histo *histo, const char *type, int val)
> +{
> + size_t bin;
> +
> + for (bin = 0; bin < histo->n_bins; ++bin)
> + dump_bin(histo, bin, type, val);
> +}
> +
> +int main(int argc, char **argv)
> +{
> + struct kshark_context *kshark_ctx;
> + struct kshark_entry **data = NULL;
> + struct kshark_trace_histo histo;
> + size_t i, n_rows, n_tasks;
> + bool status;
> + int *pids;
See how nice the upside-down-xmas tree format looks :-)
The rest of this patch looks fine.
-- Steve
> +
> + /* 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)
> + status = kshark_open(kshark_ctx, argv[1]);
> + else
> + status = kshark_open(kshark_ctx, default_file);
> +
> + if (!status) {
> + kshark_free(kshark_ctx);
> + return 1;
> + }
> +
> + /* Load the content of the file into an array of entries. */
> + n_rows = kshark_load_data_entries(kshark_ctx, &data);
> +
> + /* Get a list of all tasks. */
> + n_tasks = kshark_get_task_pids(kshark_ctx, &pids);
> +
> + /* Initialize the Visualization Model. */
> + ksmodel_init(&histo);
> + ksmodel_set_bining(&histo, N_BINS, data[0]->ts,
> + data[n_rows - 1]->ts);
> +
> + /* Fill the model with data and calculate its state. */
> + ksmodel_fill(&histo, data, n_rows);
> +
> + /* Dump the raw bins. */
> + dump_histo(&histo, "", 0);
> +
> + puts("\n...\n\n");
> +
> + /*
> + * Change the state of the model. Do 50% Zoom-In and dump only CPU 0.
> + */
> + ksmodel_zoom_in(&histo, .50, -1);
> + dump_histo(&histo, "cpu", 0);
> +
> + puts("\n...\n\n");
> +
> + /* Shift forward by two bins and this time dump only CPU 1. */
> + ksmodel_shift_forward(&histo, 2);
> + dump_histo(&histo, "cpu", 1);
> +
> + puts("\n...\n\n");
> +
> + /*
> + * Do 10% Zoom-Out, using the last bin as a focal point. Dump the last
> + * Task.
> + */
> + ksmodel_zoom_out(&histo, .10, N_BINS - 1);
> + dump_histo(&histo, "task", pids[n_tasks - 1]);
> +
> + /* Reset (clear) the model. */
> + ksmodel_clear(&histo);
> +
> + /* Free the memory. */
> + for (i = 0; i < n_rows; ++i)
> + free(data[i]);
> +
> + free(data);
> +
> + /* Close the file. */
> + kshark_close(kshark_ctx);
> +
> + /* Close the session. */
> + kshark_free(kshark_ctx);
> +
> + return 0;
> +}
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