#include "../perf.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "session.h"
#include "thread.h"
#include "thread-stack.h"
#include "util.h"
#include "debug.h"
#include "comm.h"
#include "unwind.h"

#include <api/fs/fs.h>

int thread__init_map_groups(struct thread *thread, struct machine *machine)
{
	pid_t pid = thread->pid_;

	if (pid == thread->tid || pid == -1) {
		thread->mg = map_groups__new(machine);
	} else {
		struct thread *leader = __machine__findnew_thread(machine, pid, pid);
		if (leader) {
			thread->mg = map_groups__get(leader->mg);
			thread__put(leader);
		}
	}

	return thread->mg ? 0 : -1;
}

struct thread *thread__new(pid_t pid, pid_t tid)
{
	char *comm_str;
	struct comm *comm;
	struct thread *thread = zalloc(sizeof(*thread));

	if (thread != NULL) {
		thread->pid_ = pid;
		thread->tid = tid;
		thread->ppid = -1;
		thread->cpu = -1;
		INIT_LIST_HEAD(&thread->comm_list);

		comm_str = malloc(32);
		if (!comm_str)
			goto err_thread;

		snprintf(comm_str, 32, ":%d", tid);
		comm = comm__new(comm_str, 0, false);
		free(comm_str);
		if (!comm)
			goto err_thread;

		list_add(&comm->list, &thread->comm_list);
		atomic_set(&thread->refcnt, 1);
		RB_CLEAR_NODE(&thread->rb_node);
	}

	return thread;

err_thread:
	free(thread);
	return NULL;
}

void thread__delete(struct thread *thread)
{
	struct comm *comm, *tmp;

	BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));

	thread_stack__free(thread);

	if (thread->mg) {
		map_groups__put(thread->mg);
		thread->mg = NULL;
	}
	list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
		list_del(&comm->list);
		comm__free(comm);
	}
	unwind__finish_access(thread);

	free(thread);
}

struct thread *thread__get(struct thread *thread)
{
	if (thread)
		atomic_inc(&thread->refcnt);
	return thread;
}

void thread__put(struct thread *thread)
{
	if (thread && atomic_dec_and_test(&thread->refcnt)) {
		/*
		 * Remove it from the dead_threads list, as last reference
		 * is gone.
		 */
		list_del_init(&thread->node);
		thread__delete(thread);
	}
}

struct comm *thread__comm(const struct thread *thread)
{
	if (list_empty(&thread->comm_list))
		return NULL;

	return list_first_entry(&thread->comm_list, struct comm, list);
}

struct comm *thread__exec_comm(const struct thread *thread)
{
	struct comm *comm, *last = NULL;

	list_for_each_entry(comm, &thread->comm_list, list) {
		if (comm->exec)
			return comm;
		last = comm;
	}

	return last;
}

int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
		       bool exec)
{
	struct comm *new, *curr = thread__comm(thread);

	/* Override the default :tid entry */
	if (!thread->comm_set) {
		int err = comm__override(curr, str, timestamp, exec);
		if (err)
			return err;
	} else {
		new = comm__new(str, timestamp, exec);
		if (!new)
			return -ENOMEM;
		list_add(&new->list, &thread->comm_list);

		if (exec)
			unwind__flush_access(thread);
	}

	thread->comm_set = true;

	return 0;
}

int thread__set_comm_from_proc(struct thread *thread)
{
	char path[64];
	char *comm = NULL;
	size_t sz;
	int err = -1;

	if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
		       thread->pid_, thread->tid) >= (int)sizeof(path)) &&
	    procfs__read_str(path, &comm, &sz) == 0) {
		comm[sz - 1] = '\0';
		err = thread__set_comm(thread, comm, 0);
	}

	return err;
}

const char *thread__comm_str(const struct thread *thread)
{
	const struct comm *comm = thread__comm(thread);

	if (!comm)
		return NULL;

	return comm__str(comm);
}

/* CHECKME: it should probably better return the max comm len from its comm list */
int thread__comm_len(struct thread *thread)
{
	if (!thread->comm_len) {
		const char *comm = thread__comm_str(thread);
		if (!comm)
			return 0;
		thread->comm_len = strlen(comm);
	}

	return thread->comm_len;
}

size_t thread__fprintf(struct thread *thread, FILE *fp)
{
	return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
	       map_groups__fprintf(thread->mg, fp);
}

int thread__insert_map(struct thread *thread, struct map *map)
{
	int ret;

	ret = unwind__prepare_access(thread, map, NULL);
	if (ret)
		return ret;

	map_groups__fixup_overlappings(thread->mg, map, stderr);
	map_groups__insert(thread->mg, map);

	return 0;
}

static int __thread__prepare_access(struct thread *thread)
{
	bool initialized = false;
	int i, err = 0;

	for (i = 0; i < MAP__NR_TYPES; ++i) {
		struct maps *maps = &thread->mg->maps[i];
		struct map *map;

		pthread_rwlock_rdlock(&maps->lock);

		for (map = maps__first(maps); map; map = map__next(map)) {
			err = unwind__prepare_access(thread, map, &initialized);
			if (err || initialized)
				break;
		}

		pthread_rwlock_unlock(&maps->lock);
	}

	return err;
}

static int thread__prepare_access(struct thread *thread)
{
	int err = 0;

	if (symbol_conf.use_callchain)
		err = __thread__prepare_access(thread);

	return err;
}

static int thread__clone_map_groups(struct thread *thread,
				    struct thread *parent)
{
	int i;

	/* This is new thread, we share map groups for process. */
	if (thread->pid_ == parent->pid_)
		return thread__prepare_access(thread);

	if (thread->mg == parent->mg) {
		pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
			 thread->pid_, thread->tid, parent->pid_, parent->tid);
		return 0;
	}

	/* But this one is new process, copy maps. */
	for (i = 0; i < MAP__NR_TYPES; ++i)
		if (map_groups__clone(thread, parent->mg, i) < 0)
			return -ENOMEM;

	return 0;
}

int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
{
	if (parent->comm_set) {
		const char *comm = thread__comm_str(parent);
		int err;
		if (!comm)
			return -ENOMEM;
		err = thread__set_comm(thread, comm, timestamp);
		if (err)
			return err;
	}

	thread->ppid = parent->tid;
	return thread__clone_map_groups(thread, parent);
}

void thread__find_cpumode_addr_location(struct thread *thread,
					enum map_type type, u64 addr,
					struct addr_location *al)
{
	size_t i;
	const u8 cpumodes[] = {
		PERF_RECORD_MISC_USER,
		PERF_RECORD_MISC_KERNEL,
		PERF_RECORD_MISC_GUEST_USER,
		PERF_RECORD_MISC_GUEST_KERNEL
	};

	for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
		thread__find_addr_location(thread, cpumodes[i], type, addr, al);
		if (al->map)
			break;
	}
}

struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
{
	if (thread->pid_ == thread->tid)
		return thread__get(thread);

	if (thread->pid_ == -1)
		return NULL;

	return machine__find_thread(machine, thread->pid_, thread->pid_);
}
er" (0x80) -- the default on most systems.

It occurs because the platform BIOS may erroneously enable an
energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not
recommended to be enabled on this SKU.

On the failing systems, this BIOS issue was not discovered when the
desktop motherboard was tested with Windows, because the BIOS also
neglects to provide the ACPI/CPPC table, that Windows requires to enable
HWP, and so Windows runs in legacy P-state mode, where this setting has
no effect.

Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and
so it runs in HWP mode, exposing this incorrect BIOS configuration.

There are several ways to address this problem.

First, Linux can also run in legacy P-state mode on this system.
As intel_pstate is how Linux enables HWP, booting with
"intel_pstate=disable"
will run in acpi-cpufreq/ondemand legacy p-state mode.

Or second, the "performance" governor can be used with intel_pstate,
which will modify HWP.EPP to 0.

Or third, starting in 4.10, the
/sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
attribute in can be updated from "balance_power" to "performance".

Or fourth, apply this patch, which fixes the erroneous setting of
MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default
configuration to function as designed.

Signed-off-by: Srinivas Pandruvada &lt;srinivas.pandruvada@linux.intel.com&gt;
Reviewed-by: Len Brown &lt;len.brown@intel.com&gt;
Cc: 4.6+ &lt;stable@vger.kernel.org&gt; # 4.6+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>Diffstat</a> (limited to 'tools/testing/radix-tree/test.h')</div><table summary='diffstat' class='diffstat'>