android_kernel_xiaomi_sm8350/kernel/taskstats.c
Charan Teja Reddy 04dbe55b1b taskstats: properly account NR_KERNEL_MISC_RECLAIMABLE
NR_KERNEL_MISC_RECLAIMABLE contains the info in pages but accounting is
done considering it as bytes. Fix it.

Change-Id: I99a3bd43b7b77f6b137e1cc4c1854392d4a47635
Fixes: 5a5b186dfb ("taskstats: add support for system stats")
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
2021-07-01 06:18:34 -07:00

1113 lines
26 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* taskstats.c - Export per-task statistics to userland
*
* Copyright (C) Shailabh Nagar, IBM Corp. 2006
* (C) Balbir Singh, IBM Corp. 2006
*/
#include <linux/kernel.h>
#include <linux/taskstats_kern.h>
#include <linux/tsacct_kern.h>
#include <linux/delayacct.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/vmalloc.h>
#include <linux/cgroupstats.h>
#include <linux/sysstats.h>
#include <linux/cgroup.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pid_namespace.h>
#include <net/genetlink.h>
#include <linux/atomic.h>
#include <linux/sched/cputime.h>
#include <linux/oom.h>
/*
* Maximum length of a cpumask that can be specified in
* the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute
*/
#define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS)
static DEFINE_PER_CPU(__u32, taskstats_seqnum);
static int family_registered;
struct kmem_cache *taskstats_cache;
static struct genl_family family;
static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
[TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 },
[TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 },
[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING },
[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },
[TASKSTATS_CMD_ATTR_FOREACH] = { .type = NLA_U32 },};
/*
* We have to use TASKSTATS_CMD_ATTR_MAX here, it is the maxattr in the family.
* Make sure they are always aligned.
*/
static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
[CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 },
};
static const struct nla_policy
sysstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
[SYSSTATS_CMD_ATTR_SYSMEM_STATS] = { .type = NLA_U32 },
};
struct listener {
struct list_head list;
pid_t pid;
char valid;
};
struct listener_list {
struct rw_semaphore sem;
struct list_head list;
};
static DEFINE_PER_CPU(struct listener_list, listener_array);
struct tgid_iter {
unsigned int tgid;
struct task_struct *task;
};
enum actions {
REGISTER,
DEREGISTER,
CPU_DONT_CARE
};
static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
size_t size)
{
struct sk_buff *skb;
void *reply;
/*
* If new attributes are added, please revisit this allocation
*/
skb = genlmsg_new(size, GFP_KERNEL);
if (!skb)
return -ENOMEM;
if (!info) {
int seq = this_cpu_inc_return(taskstats_seqnum) - 1;
reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
} else
reply = genlmsg_put_reply(skb, info, &family, 0, cmd);
if (reply == NULL) {
nlmsg_free(skb);
return -EINVAL;
}
*skbp = skb;
return 0;
}
/*
* Send taskstats data in @skb to listener with nl_pid @pid
*/
static int send_reply(struct sk_buff *skb, struct genl_info *info)
{
struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
void *reply = genlmsg_data(genlhdr);
genlmsg_end(skb, reply);
return genlmsg_reply(skb, info);
}
/*
* Send taskstats data in @skb to listeners registered for @cpu's exit data
*/
static void send_cpu_listeners(struct sk_buff *skb,
struct listener_list *listeners)
{
struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
struct listener *s, *tmp;
struct sk_buff *skb_next, *skb_cur = skb;
void *reply = genlmsg_data(genlhdr);
int rc, delcount = 0;
genlmsg_end(skb, reply);
rc = 0;
down_read(&listeners->sem);
list_for_each_entry(s, &listeners->list, list) {
skb_next = NULL;
if (!list_is_last(&s->list, &listeners->list)) {
skb_next = skb_clone(skb_cur, GFP_KERNEL);
if (!skb_next)
break;
}
rc = genlmsg_unicast(&init_net, skb_cur, s->pid);
if (rc == -ECONNREFUSED) {
s->valid = 0;
delcount++;
}
skb_cur = skb_next;
}
up_read(&listeners->sem);
if (skb_cur)
nlmsg_free(skb_cur);
if (!delcount)
return;
/* Delete invalidated entries */
down_write(&listeners->sem);
list_for_each_entry_safe(s, tmp, &listeners->list, list) {
if (!s->valid) {
list_del(&s->list);
kfree(s);
}
}
up_write(&listeners->sem);
}
static void fill_stats(struct user_namespace *user_ns,
struct pid_namespace *pid_ns,
struct task_struct *tsk, struct taskstats *stats)
{
memset(stats, 0, sizeof(*stats));
/*
* Each accounting subsystem adds calls to its functions to
* fill in relevant parts of struct taskstsats as follows
*
* per-task-foo(stats, tsk);
*/
delayacct_add_tsk(stats, tsk);
/* fill in basic acct fields */
stats->version = TASKSTATS_VERSION;
stats->nvcsw = tsk->nvcsw;
stats->nivcsw = tsk->nivcsw;
bacct_add_tsk(user_ns, pid_ns, stats, tsk);
/* fill in extended acct fields */
xacct_add_tsk(stats, tsk);
}
static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
{
struct task_struct *tsk;
tsk = find_get_task_by_vpid(pid);
if (!tsk)
return -ESRCH;
fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats);
put_task_struct(tsk);
return 0;
}
static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
{
struct task_struct *tsk, *first;
unsigned long flags;
int rc = -ESRCH;
u64 delta, utime, stime;
u64 start_time;
/*
* Add additional stats from live tasks except zombie thread group
* leaders who are already counted with the dead tasks
*/
rcu_read_lock();
first = find_task_by_vpid(tgid);
if (!first || !lock_task_sighand(first, &flags))
goto out;
if (first->signal->stats)
memcpy(stats, first->signal->stats, sizeof(*stats));
else
memset(stats, 0, sizeof(*stats));
tsk = first;
start_time = ktime_get_ns();
do {
if (tsk->exit_state)
continue;
/*
* Accounting subsystem can call its functions here to
* fill in relevant parts of struct taskstsats as follows
*
* per-task-foo(stats, tsk);
*/
delayacct_add_tsk(stats, tsk);
/* calculate task elapsed time in nsec */
delta = start_time - tsk->start_time;
/* Convert to micro seconds */
do_div(delta, NSEC_PER_USEC);
stats->ac_etime += delta;
task_cputime(tsk, &utime, &stime);
stats->ac_utime += div_u64(utime, NSEC_PER_USEC);
stats->ac_stime += div_u64(stime, NSEC_PER_USEC);
stats->nvcsw += tsk->nvcsw;
stats->nivcsw += tsk->nivcsw;
} while_each_thread(first, tsk);
unlock_task_sighand(first, &flags);
rc = 0;
out:
rcu_read_unlock();
stats->version = TASKSTATS_VERSION;
/*
* Accounting subsystems can also add calls here to modify
* fields of taskstats.
*/
return rc;
}
static void fill_tgid_exit(struct task_struct *tsk)
{
unsigned long flags;
spin_lock_irqsave(&tsk->sighand->siglock, flags);
if (!tsk->signal->stats)
goto ret;
/*
* Each accounting subsystem calls its functions here to
* accumalate its per-task stats for tsk, into the per-tgid structure
*
* per-task-foo(tsk->signal->stats, tsk);
*/
delayacct_add_tsk(tsk->signal->stats, tsk);
ret:
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
return;
}
static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
{
struct listener_list *listeners;
struct listener *s, *tmp, *s2;
unsigned int cpu;
int ret = 0;
if (!cpumask_subset(mask, cpu_possible_mask))
return -EINVAL;
if (current_user_ns() != &init_user_ns)
return -EINVAL;
if (task_active_pid_ns(current) != &init_pid_ns)
return -EINVAL;
if (isadd == REGISTER) {
for_each_cpu(cpu, mask) {
s = kmalloc_node(sizeof(struct listener),
GFP_KERNEL, cpu_to_node(cpu));
if (!s) {
ret = -ENOMEM;
goto cleanup;
}
s->pid = pid;
s->valid = 1;
listeners = &per_cpu(listener_array, cpu);
down_write(&listeners->sem);
list_for_each_entry(s2, &listeners->list, list) {
if (s2->pid == pid && s2->valid)
goto exists;
}
list_add(&s->list, &listeners->list);
s = NULL;
exists:
up_write(&listeners->sem);
kfree(s); /* nop if NULL */
}
return 0;
}
/* Deregister or cleanup */
cleanup:
for_each_cpu(cpu, mask) {
listeners = &per_cpu(listener_array, cpu);
down_write(&listeners->sem);
list_for_each_entry_safe(s, tmp, &listeners->list, list) {
if (s->pid == pid) {
list_del(&s->list);
kfree(s);
break;
}
}
up_write(&listeners->sem);
}
return ret;
}
static int parse(struct nlattr *na, struct cpumask *mask)
{
char *data;
int len;
int ret;
if (na == NULL)
return 1;
len = nla_len(na);
if (len > TASKSTATS_CPUMASK_MAXLEN)
return -E2BIG;
if (len < 1)
return -EINVAL;
data = kmalloc(len, GFP_KERNEL);
if (!data)
return -ENOMEM;
nla_strlcpy(data, na, len);
ret = cpulist_parse(data, mask);
kfree(data);
return ret;
}
static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid)
{
struct nlattr *na, *ret;
int aggr;
aggr = (type == TASKSTATS_TYPE_PID)
? TASKSTATS_TYPE_AGGR_PID
: TASKSTATS_TYPE_AGGR_TGID;
na = nla_nest_start_noflag(skb, aggr);
if (!na)
goto err;
if (nla_put(skb, type, sizeof(pid), &pid) < 0) {
nla_nest_cancel(skb, na);
goto err;
}
ret = nla_reserve_64bit(skb, TASKSTATS_TYPE_STATS,
sizeof(struct taskstats), TASKSTATS_TYPE_NULL);
if (!ret) {
nla_nest_cancel(skb, na);
goto err;
}
nla_nest_end(skb, na);
return nla_data(ret);
err:
return NULL;
}
#define K(x) ((x) << (PAGE_SHIFT - 10))
#ifndef CONFIG_NUMA
static void sysstats_fill_zoneinfo(struct sys_memstats *stats)
{
pg_data_t *pgdat;
struct zone *zone;
struct zone *node_zones;
unsigned long zspages = 0;
pgdat = NODE_DATA(0);
node_zones = pgdat->node_zones;
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
if (!populated_zone(zone))
continue;
zspages += zone_page_state(zone, NR_ZSPAGES);
if (!strcmp(zone->name, "DMA")) {
stats->dma_nr_free_pages =
K(zone_page_state(zone, NR_FREE_PAGES));
stats->dma_nr_active_anon =
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
stats->dma_nr_inactive_anon =
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
stats->dma_nr_active_file =
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
stats->dma_nr_inactive_file =
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
} else if (!strcmp(zone->name, "Normal")) {
stats->normal_nr_free_pages =
K(zone_page_state(zone, NR_FREE_PAGES));
stats->normal_nr_active_anon =
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
stats->normal_nr_inactive_anon =
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
stats->normal_nr_active_file =
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
stats->normal_nr_inactive_file =
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
} else if (!strcmp(zone->name, "HighMem")) {
stats->highmem_nr_free_pages =
K(zone_page_state(zone, NR_FREE_PAGES));
stats->highmem_nr_active_anon =
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
stats->highmem_nr_inactive_anon =
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
stats->highmem_nr_active_file =
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
stats->highmem_nr_inactive_file =
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
} else if (!strcmp(zone->name, "Movable")) {
stats->movable_nr_free_pages =
K(zone_page_state(zone, NR_FREE_PAGES));
stats->movable_nr_active_anon =
K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON));
stats->movable_nr_inactive_anon =
K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON));
stats->movable_nr_active_file =
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE));
stats->movable_nr_inactive_file =
K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE));
}
}
stats->zram_compressed = K(zspages);
}
#elif
static void sysstats_fill_zoneinfo(struct sys_memstats *stats)
{
}
#endif
static void sysstats_build(struct sys_memstats *stats)
{
struct sysinfo i;
si_meminfo(&i);
si_swapinfo(&i);
stats->version = SYSSTATS_VERSION;
stats->memtotal = K(i.totalram);
stats->reclaimable =
K(global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
stats->swap_used = K(i.totalswap - i.freeswap);
stats->swap_total = K(i.totalswap);
stats->vmalloc_total = K(vmalloc_nr_pages());
#ifdef CONFIG_MM_STAT_UNRECLAIMABLE_PAGES
stats->unreclaimable =
K(global_node_page_state(NR_UNRECLAIMABLE_PAGES));
#else
stats->unreclaimable = 0;
#endif
stats->buffer = K(i.bufferram);
stats->swapcache = K(total_swapcache_pages());
stats->slab_reclaimable =
K(global_node_page_state(NR_SLAB_RECLAIMABLE));
stats->slab_unreclaimable =
K(global_node_page_state(NR_SLAB_UNRECLAIMABLE));
stats->free_cma = K(global_zone_page_state(NR_FREE_CMA_PAGES));
stats->file_mapped = K(global_node_page_state(NR_FILE_MAPPED));
stats->kernelstack = global_zone_page_state(NR_KERNEL_STACK_KB);
stats->pagetable = K(global_zone_page_state(NR_PAGETABLE));
stats->shmem = K(i.sharedram);
sysstats_fill_zoneinfo(stats);
}
#undef K
static int sysstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
int rc = 0;
struct sk_buff *rep_skb;
struct sys_memstats *stats;
struct nlattr *na;
size_t size;
size = nla_total_size(sizeof(struct sys_memstats));
rc = prepare_reply(info, SYSSTATS_CMD_NEW, &rep_skb,
size);
if (rc < 0)
goto err;
na = nla_reserve(rep_skb, SYSSTATS_TYPE_SYSMEM_STATS,
sizeof(struct sys_memstats));
if (na == NULL) {
nlmsg_free(rep_skb);
rc = -EMSGSIZE;
goto err;
}
stats = nla_data(na);
memset(stats, 0, sizeof(*stats));
sysstats_build(stats);
rc = send_reply(rep_skb, info);
err:
return rc;
}
static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
int rc = 0;
struct sk_buff *rep_skb;
struct cgroupstats *stats;
struct nlattr *na;
size_t size;
u32 fd;
struct fd f;
na = info->attrs[CGROUPSTATS_CMD_ATTR_FD];
if (!na)
return -EINVAL;
fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
f = fdget(fd);
if (!f.file)
return 0;
size = nla_total_size(sizeof(struct cgroupstats));
rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
size);
if (rc < 0)
goto err;
na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
sizeof(struct cgroupstats));
if (na == NULL) {
nlmsg_free(rep_skb);
rc = -EMSGSIZE;
goto err;
}
stats = nla_data(na);
memset(stats, 0, sizeof(*stats));
rc = cgroupstats_build(stats, f.file->f_path.dentry);
if (rc < 0) {
nlmsg_free(rep_skb);
goto err;
}
rc = send_reply(rep_skb, info);
err:
fdput(f);
return rc;
}
static int cmd_attr_register_cpumask(struct genl_info *info)
{
cpumask_var_t mask;
int rc;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask);
if (rc < 0)
goto out;
rc = add_del_listener(info->snd_portid, mask, REGISTER);
out:
free_cpumask_var(mask);
return rc;
}
static int cmd_attr_deregister_cpumask(struct genl_info *info)
{
cpumask_var_t mask;
int rc;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask);
if (rc < 0)
goto out;
rc = add_del_listener(info->snd_portid, mask, DEREGISTER);
out:
free_cpumask_var(mask);
return rc;
}
static size_t taskstats_packet_size(void)
{
size_t size;
size = nla_total_size(sizeof(u32)) +
nla_total_size_64bit(sizeof(struct taskstats)) +
nla_total_size(0);
return size;
}
static int taskstats2_cmd_attr_pid(struct genl_info *info)
{
struct taskstats2 *stats;
struct sk_buff *rep_skb;
struct nlattr *ret;
struct task_struct *tsk;
struct task_struct *p;
size_t size;
u32 pid;
int rc;
u64 utime, stime;
const struct cred *tcred;
#ifdef CONFIG_CPUSETS
struct cgroup_subsys_state *css;
#endif //CONFIG_CPUSETS
unsigned long flags;
struct signal_struct *sig;
size = nla_total_size_64bit(sizeof(struct taskstats2));
rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
if (rc < 0)
return rc;
rc = -EINVAL;
pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]);
ret = nla_reserve_64bit(rep_skb, TASKSTATS_TYPE_STATS,
sizeof(struct taskstats2), TASKSTATS_TYPE_NULL);
if (!ret)
goto err;
stats = nla_data(ret);
rcu_read_lock();
tsk = find_task_by_vpid(pid);
if (tsk)
get_task_struct(tsk);
rcu_read_unlock();
if (!tsk) {
rc = -ESRCH;
goto err;
}
memset(stats, 0, sizeof(*stats));
stats->version = TASKSTATS2_VERSION;
stats->pid = task_pid_nr_ns(tsk, task_active_pid_ns(current));
p = find_lock_task_mm(tsk);
if (p) {
__acquire(p->alloc_lock); /* Fake it out ;) */
#define K(x) ((x) << (PAGE_SHIFT - 10))
stats->anon_rss = K(get_mm_counter(p->mm, MM_ANONPAGES));
stats->file_rss = K(get_mm_counter(p->mm, MM_FILEPAGES));
stats->shmem_rss = K(get_mm_counter(p->mm, MM_SHMEMPAGES));
stats->swap_rss = K(get_mm_counter(p->mm, MM_SWAPENTS));
#ifdef CONFIG_MM_STAT_UNRECLAIMABLE_PAGES
stats->unreclaimable =
K(get_mm_counter(p->mm, MM_UNRECLAIMABLE));
#else
stats->unreclaimable = 0;
#endif
#undef K
task_unlock(p);
}
/* version 2 fields begin here */
task_cputime(tsk, &utime, &stime);
stats->utime = div_u64(utime, NSEC_PER_USEC);
stats->stime = div_u64(stime, NSEC_PER_USEC);
if (lock_task_sighand(tsk, &flags)) {
sig = tsk->signal;
stats->cutime = sig->cutime;
stats->cstime = sig->cstime;
unlock_task_sighand(tsk, &flags);
}
rcu_read_lock();
tcred = __task_cred(tsk);
stats->uid = from_kuid_munged(current_user_ns(), tcred->uid);
stats->ppid = pid_alive(tsk) ?
task_tgid_nr_ns(rcu_dereference(tsk->real_parent),
task_active_pid_ns(current)) : 0;
rcu_read_unlock();
strlcpy(stats->name, tsk->comm, sizeof(stats->name));
#ifdef CONFIG_CPUSETS
css = task_get_css(tsk, cpuset_cgrp_id);
cgroup_path_ns(css->cgroup, stats->state, sizeof(stats->state),
current->nsproxy->cgroup_ns);
css_put(css);
#endif //CONFIG_CPUSETS
/* version 2 fields end here */
put_task_struct(tsk);
return send_reply(rep_skb, info);
err:
nlmsg_free(rep_skb);
return rc;
}
static int cmd_attr_pid(struct genl_info *info)
{
struct taskstats *stats;
struct sk_buff *rep_skb;
size_t size;
u32 pid;
int rc;
size = taskstats_packet_size();
rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
if (rc < 0)
return rc;
rc = -EINVAL;
pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]);
stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid);
if (!stats)
goto err;
rc = fill_stats_for_pid(pid, stats);
if (rc < 0)
goto err;
return send_reply(rep_skb, info);
err:
nlmsg_free(rep_skb);
return rc;
}
static int cmd_attr_tgid(struct genl_info *info)
{
struct taskstats *stats;
struct sk_buff *rep_skb;
size_t size;
u32 tgid;
int rc;
size = taskstats_packet_size();
rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
if (rc < 0)
return rc;
rc = -EINVAL;
tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]);
stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid);
if (!stats)
goto err;
rc = fill_stats_for_tgid(tgid, stats);
if (rc < 0)
goto err;
return send_reply(rep_skb, info);
err:
nlmsg_free(rep_skb);
return rc;
}
static struct tgid_iter next_tgid(struct pid_namespace *ns,
struct tgid_iter iter)
{
struct pid *pid;
if (iter.task)
put_task_struct(iter.task);
rcu_read_lock();
retry:
iter.task = NULL;
pid = find_ge_pid(iter.tgid, ns);
if (pid) {
iter.tgid = pid_nr_ns(pid, ns);
iter.task = pid_task(pid, PIDTYPE_PID);
if (!iter.task || !has_group_leader_pid(iter.task)) {
iter.tgid += 1;
goto retry;
}
get_task_struct(iter.task);
}
rcu_read_unlock();
return iter;
}
static int taskstats2_foreach(struct sk_buff *skb, struct netlink_callback *cb)
{
struct pid_namespace *ns = task_active_pid_ns(current);
struct tgid_iter iter;
void *reply;
struct nlattr *attr;
struct nlattr *nla;
struct taskstats2 *stats;
struct task_struct *p;
short oom_score;
short oom_score_min;
short oom_score_max;
u32 buf;
nla = nla_find(nlmsg_attrdata(cb->nlh, GENL_HDRLEN),
nlmsg_attrlen(cb->nlh, GENL_HDRLEN),
TASKSTATS_TYPE_FOREACH);
if (!nla)
goto out;
buf = nla_get_u32(nla);
oom_score_min = (short) (buf & 0xFFFF);
oom_score_max = (short) ((buf >> 16) & 0xFFFF);
iter.tgid = cb->args[0];
iter.task = NULL;
for (iter = next_tgid(ns, iter); iter.task;
iter.tgid += 1, iter = next_tgid(ns, iter)) {
if (iter.task->flags & PF_KTHREAD)
continue;
oom_score = iter.task->signal->oom_score_adj;
if ((oom_score < oom_score_min)
|| (oom_score > oom_score_max))
continue;
reply = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, &family, 0, TASKSTATS2_CMD_GET);
if (reply == NULL) {
put_task_struct(iter.task);
break;
}
attr = nla_reserve(skb, TASKSTATS_TYPE_FOREACH,
sizeof(struct taskstats2));
if (!attr) {
put_task_struct(iter.task);
genlmsg_cancel(skb, reply);
break;
}
stats = nla_data(attr);
memset(stats, 0, sizeof(struct taskstats2));
stats->version = TASKSTATS2_VERSION;
rcu_read_lock();
stats->pid = task_pid_nr_ns(iter.task,
task_active_pid_ns(current));
stats->oom_score = iter.task->signal->oom_score_adj;
rcu_read_unlock();
p = find_lock_task_mm(iter.task);
if (p) {
#define K(x) ((x) << (PAGE_SHIFT - 10))
__acquire(p->alloc_lock); /* Fake it out ;) */
stats->anon_rss =
K(get_mm_counter(p->mm, MM_ANONPAGES));
stats->file_rss =
K(get_mm_counter(p->mm, MM_FILEPAGES));
stats->shmem_rss =
K(get_mm_counter(p->mm, MM_SHMEMPAGES));
stats->swap_rss =
K(get_mm_counter(p->mm, MM_SWAPENTS));
task_unlock(p);
#undef K
}
genlmsg_end(skb, reply);
}
cb->args[0] = iter.tgid;
out:
return skb->len;
}
static int taskstats2_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
if (info->attrs[TASKSTATS_CMD_ATTR_PID])
return taskstats2_cmd_attr_pid(info);
else
return -EINVAL;
}
static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK])
return cmd_attr_register_cpumask(info);
else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK])
return cmd_attr_deregister_cpumask(info);
else if (info->attrs[TASKSTATS_CMD_ATTR_PID])
return cmd_attr_pid(info);
else if (info->attrs[TASKSTATS_CMD_ATTR_TGID])
return cmd_attr_tgid(info);
else
return -EINVAL;
}
static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk)
{
struct signal_struct *sig = tsk->signal;
struct taskstats *stats_new, *stats;
/* Pairs with smp_store_release() below. */
stats = smp_load_acquire(&sig->stats);
if (stats || thread_group_empty(tsk))
return stats;
/* No problem if kmem_cache_zalloc() fails */
stats_new = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);
spin_lock_irq(&tsk->sighand->siglock);
stats = sig->stats;
if (!stats) {
/*
* Pairs with smp_store_release() above and order the
* kmem_cache_zalloc().
*/
smp_store_release(&sig->stats, stats_new);
stats = stats_new;
stats_new = NULL;
}
spin_unlock_irq(&tsk->sighand->siglock);
if (stats_new)
kmem_cache_free(taskstats_cache, stats_new);
return stats;
}
/* Send pid data out on exit */
void taskstats_exit(struct task_struct *tsk, int group_dead)
{
int rc;
struct listener_list *listeners;
struct taskstats *stats;
struct sk_buff *rep_skb;
size_t size;
int is_thread_group;
if (!family_registered)
return;
/*
* Size includes space for nested attributes
*/
size = taskstats_packet_size();
is_thread_group = !!taskstats_tgid_alloc(tsk);
if (is_thread_group) {
/* PID + STATS + TGID + STATS */
size = 2 * size;
/* fill the tsk->signal->stats structure */
fill_tgid_exit(tsk);
}
listeners = raw_cpu_ptr(&listener_array);
if (list_empty(&listeners->list))
return;
rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size);
if (rc < 0)
return;
stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID,
task_pid_nr_ns(tsk, &init_pid_ns));
if (!stats)
goto err;
fill_stats(&init_user_ns, &init_pid_ns, tsk, stats);
/*
* Doesn't matter if tsk is the leader or the last group member leaving
*/
if (!is_thread_group || !group_dead)
goto send;
stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID,
task_tgid_nr_ns(tsk, &init_pid_ns));
if (!stats)
goto err;
memcpy(stats, tsk->signal->stats, sizeof(*stats));
send:
send_cpu_listeners(rep_skb, listeners);
return;
err:
nlmsg_free(rep_skb);
}
static const struct genl_ops taskstats_ops[] = {
{
.cmd = TASKSTATS_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = taskstats_user_cmd,
/* policy enforced later */
.flags = GENL_ADMIN_PERM | GENL_CMD_CAP_HASPOL,
},
{
.cmd = TASKSTATS2_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = taskstats2_user_cmd,
.dumpit = taskstats2_foreach,
/* policy enforced later */
},
{
.cmd = CGROUPSTATS_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = cgroupstats_user_cmd,
/* policy enforced later */
.flags = GENL_CMD_CAP_HASPOL,
},
{
.cmd = SYSSTATS_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = sysstats_user_cmd,
/* policy enforced later */
},
};
static int taskstats_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
struct genl_info *info)
{
const struct nla_policy *policy = NULL;
switch (ops->cmd) {
case TASKSTATS_CMD_GET:
case TASKSTATS2_CMD_GET:
policy = taskstats_cmd_get_policy;
break;
case CGROUPSTATS_CMD_GET:
policy = cgroupstats_cmd_get_policy;
break;
case SYSSTATS_CMD_GET:
policy = sysstats_cmd_get_policy;
break;
default:
return -EINVAL;
}
return nlmsg_validate_deprecated(info->nlhdr, GENL_HDRLEN,
TASKSTATS_CMD_ATTR_MAX, policy,
info->extack);
}
static struct genl_family family __ro_after_init = {
.name = TASKSTATS_GENL_NAME,
.version = TASKSTATS_GENL_VERSION,
.maxattr = TASKSTATS_CMD_ATTR_MAX,
.module = THIS_MODULE,
.ops = taskstats_ops,
.n_ops = ARRAY_SIZE(taskstats_ops),
.pre_doit = taskstats_pre_doit,
};
/* Needed early in initialization */
void __init taskstats_init_early(void)
{
unsigned int i;
taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC);
for_each_possible_cpu(i) {
INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
init_rwsem(&(per_cpu(listener_array, i).sem));
}
}
static int __init taskstats_init(void)
{
int rc;
rc = genl_register_family(&family);
if (rc)
return rc;
family_registered = 1;
pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION);
return 0;
}
/*
* late initcall ensures initialization of statistics collection
* mechanisms precedes initialization of the taskstats interface
*/
late_initcall(taskstats_init);