#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <linux/bpf.h>
#include <string.h>

#include "libbpf.h"
#include "bpf_load.h"
#include "bpf_util.h"

#define MAX_INDEX	64
#define MAX_STARS	38

static void stars(char *str, long val, long max, int width)
{
	int i;

	for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
		str[i] = '*';
	if (val > max)
		str[i - 1] = '+';
	str[i] = '\0';
}

struct task {
	char comm[16];
	__u64 pid_tgid;
	__u64 uid_gid;
};

struct hist_key {
	struct task t;
	__u32 index;
};

#define SIZE sizeof(struct task)

static void print_hist_for_pid(int fd, void *task)
{
	unsigned int nr_cpus = bpf_num_possible_cpus();
	struct hist_key key = {}, next_key;
	long values[nr_cpus];
	char starstr[MAX_STARS];
	long value;
	long data[MAX_INDEX] = {};
	int max_ind = -1;
	long max_value = 0;
	int i, ind;

	while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
		if (memcmp(&next_key, task, SIZE)) {
			key = next_key;
			continue;
		}
		bpf_map_lookup_elem(fd, &next_key, values);
		value = 0;
		for (i = 0; i < nr_cpus; i++)
			value += values[i];
		ind = next_key.index;
		data[ind] = value;
		if (value && ind > max_ind)
			max_ind = ind;
		if (value > max_value)
			max_value = value;
		key = next_key;
	}

	printf("           syscall write() stats\n");
	printf("     byte_size       : count     distribution\n");
	for (i = 1; i <= max_ind + 1; i++) {
		stars(starstr, data[i - 1], max_value, MAX_STARS);
		printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
		       (1l << i) >> 1, (1l << i) - 1, data[i - 1],
		       MAX_STARS, starstr);
	}
}

static void print_hist(int fd)
{
	struct hist_key key = {}, next_key;
	static struct task tasks[1024];
	int task_cnt = 0;
	int i;

	while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
		int found = 0;

		for (i = 0; i < task_cnt; i++)
			if (memcmp(&tasks[i], &next_key, SIZE) == 0)
				found = 1;
		if (!found)
			memcpy(&tasks[task_cnt++], &next_key, SIZE);
		key = next_key;
	}

	for (i = 0; i < task_cnt; i++) {
		printf("\npid %d cmd %s uid %d\n",
		       (__u32) tasks[i].pid_tgid,
		       tasks[i].comm,
		       (__u32) tasks[i].uid_gid);
		print_hist_for_pid(fd, &tasks[i]);
	}

}

static void int_exit(int sig)
{
	print_hist(map_fd[1]);
	exit(0);
}

int main(int ac, char **argv)
{
	char filename[256];
	long key, next_key, value;
	FILE *f;
	int i;

	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

	signal(SIGINT, int_exit);

	/* start 'ping' in the background to have some kfree_skb events */
	f = popen("ping -c5 localhost", "r");
	(void) f;

	/* start 'dd' in the background to have plenty of 'write' syscalls */
	f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
	(void) f;

	if (load_bpf_file(filename)) {
		printf("%s", bpf_log_buf);
		return 1;
	}

	for (i = 0; i < 5; i++) {
		key = 0;
		while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
			bpf_map_lookup_elem(map_fd[0], &next_key, &value);
			printf("location 0x%lx count %ld\n", next_key, value);
			key = next_key;
		}
		if (key)
			printf("\n");
		sleep(1);
	}
	print_hist(map_fd[1]);

	return 0;
}
-next.git/log/sound/isa?h=nds-private-remove&amp;id=57bcd0a6364cd4eaa362d7ff1777e88ddf501602'>isa</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/isa/cs423x?h=nds-private-remove&amp;id=57bcd0a6364cd4eaa362d7ff1777e88ddf501602'>cs423x</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/isa/cs423x/cs4231.c?h=nds-private-remove&amp;id=57bcd0a6364cd4eaa362d7ff1777e88ddf501602'>cs4231.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/isa/cs423x/cs4231.c?h=nds-private-remove&amp;id=57bcd0a6364cd4eaa362d7ff1777e88ddf501602&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
);'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=f9a42e0d58cf0fe3d902e63d4582f2ea4cd2bb8b'>Diffstat</a> (limited to 'net/mac80211/wpa.c')</div><table summary='diffstat' class='diffstat'>m></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 23:58:38 +0100</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 08:37:27 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/tegra/Kconfig?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>dd86e373e09fb16b83e8adf5c48c421a4ca76468</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/tegra/Kconfig?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>55703c2ea8584e303e342090614e0aab3509ab21</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/tegra/Kconfig?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>sound/soc/tegra/Kconfig</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/tegra/Kconfig?id=0b3589be9b98994ce3d5aeca52445d1f5627c4ba'>0b3589be9b98994ce3d5aeca52445d1f5627c4ba</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/tegra/Kconfig?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468&amp;id2=0b3589be9b98994ce3d5aeca52445d1f5627c4ba'>diff</a>)</td></tr></table>
<div class='commit-subject'>perf/x86/intel/rapl: Make package handling more robust</div><div class='commit-msg'>The package management code in RAPL relies on package mapping being
available before a CPU is started. This changed with:

  9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")

because the ACPI/BIOS information turned out to be unreliable, but that
left RAPL in broken state. This was not noticed because on a regular boot
all CPUs are online before RAPL is initialized.

A possible fix would be to reintroduce the mess which allocates a package
data structure in CPU prepare and when it turns out to already exist in
starting throw it away later in the CPU online callback. But that's a
horrible hack and not required at all because RAPL becomes functional for
perf only in the CPU online callback. That's correct because user space is
not yet informed about the CPU being onlined, so nothing caan rely on RAPL
being available on that particular CPU.

Move the allocation to the CPU online callback and simplify the hotplug
handling. At this point the package mapping is established and correct.

This also adds a missing check for available package data in the
event_init() function.

Reported-by: Yasuaki Ishimatsu &lt;yasu.isimatu@gmail.com&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Alexander Shishkin &lt;alexander.shishkin@linux.intel.com&gt;
Cc: Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;
Cc: Jiri Olsa &lt;jolsa@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Sebastian Siewior &lt;bigeasy@linutronix.de&gt;
Cc: Stephane Eranian &lt;eranian@google.com&gt;
Cc: Vince Weaver &lt;vincent.weaver@maine.edu&gt;
Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")
Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>Diffstat</a> (limited to 'sound/soc/tegra/Kconfig')</div><table summary='diffstat' class='diffstat'>