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Commit ce765ecd authored by Connor O'Brien's avatar Connor O'Brien Committed by Todd Kjos
Browse files

ANDROID: cpufreq: Add time_in_state to /proc/uid directories 



Add per-uid files that report the data in binary format rather than
text, to allow faster reading & parsing by userspace.

Signed-off-by: default avatarConnor O'Brien <connoro@google.com>
Bug: 72339335
Bug: 127641090
Test: compare values to those reported in /proc/uid_time_in_state
Change-Id: I463039ea7f17b842be4c70024fe772539fe2ce02
parent 864b400f

drivers/cpufreq/cpufreq_times.c

+49 −0
Original line number Diff line number Diff line
@@ -58,6 +58,19 @@ static struct cpu_freqs *all_freqs[NR_CPUS]; 


static unsigned int next_offset;





/* Caller must hold rcu_read_lock() */

static struct uid_entry *find_uid_entry_rcu(uid_t uid)

{

	struct uid_entry *uid_entry;



	hash_for_each_possible_rcu(uid_hash_table, uid_entry, hash, uid) {

		if (uid_entry->uid == uid)

			return uid_entry;

	}

	return NULL;

}



/* Caller must hold uid lock */

static struct uid_entry *find_uid_entry_locked(uid_t uid)

{
@@ -127,6 +140,36 @@ static bool freq_index_invalid(unsigned int index) 
	return true;

}



static int single_uid_time_in_state_show(struct seq_file *m, void *ptr)

{

	struct uid_entry *uid_entry;

	unsigned int i;

	u64 time;

	uid_t uid = from_kuid_munged(current_user_ns(), *(kuid_t *)m->private);



	if (uid == overflowuid)

		return -EINVAL;



	rcu_read_lock();



	uid_entry = find_uid_entry_rcu(uid);

	if (!uid_entry) {

		rcu_read_unlock();

		return 0;

	}



	for (i = 0; i < uid_entry->max_state; ++i) {

		if (freq_index_invalid(i))

			continue;

		time = nsec_to_clock_t(uid_entry->time_in_state[i]);

		seq_write(m, &time, sizeof(time));

	}



	rcu_read_unlock();



	return 0;

}



static void *uid_seq_start(struct seq_file *seq, loff_t *pos)

{

	if (*pos >= HASH_SIZE(uid_hash_table))
@@ -397,6 +440,12 @@ static int uid_time_in_state_open(struct inode *inode, struct file *file) 
	return seq_open(file, &uid_time_in_state_seq_ops);

}



int single_uid_time_in_state_open(struct inode *inode, struct file *file)

{

	return single_open(file, single_uid_time_in_state_show,

			&(inode->i_uid));

}



static const struct file_operations uid_time_in_state_fops = {

	.open		= uid_time_in_state_open,

	.read		= seq_read,

fs/proc/uid.c

+15 −1
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
 * /proc/uid support

 */



#include <linux/cpufreq_times.h>

#include <linux/fs.h>

#include <linux/hashtable.h>

#include <linux/init.h>
@@ -82,7 +83,20 @@ struct uid_entry { 
	.fop	= FOP,					\

}



static const struct uid_entry uid_base_stuff[] = {};

#ifdef CONFIG_CPU_FREQ_TIMES

static const struct file_operations proc_uid_time_in_state_operations = {

	.open		= single_uid_time_in_state_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};

#endif



static const struct uid_entry uid_base_stuff[] = {

#ifdef CONFIG_CPU_FREQ_TIMES

	NOD("time_in_state", 0444, NULL, &proc_uid_time_in_state_operations),

#endif

};



static const struct inode_operations proc_uid_def_inode_operations = {

	.setattr	= proc_setattr,

include/linux/cpufreq_times.h

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ void cpufreq_acct_update_power(struct task_struct *p, u64 cputime); 
void cpufreq_times_create_policy(struct cpufreq_policy *policy);

void cpufreq_times_record_transition(struct cpufreq_freqs *freq);

void cpufreq_task_times_remove_uids(uid_t uid_start, uid_t uid_end);

int single_uid_time_in_state_open(struct inode *inode, struct file *file);

#else

static inline void cpufreq_task_times_init(struct task_struct *p) {}

static inline void cpufreq_task_times_alloc(struct task_struct *p) {}