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// SPDX-License-Identifier: GPL-2.0
/*
* mm/reclaim_acct.c
*
* Copyright (c) 2022 Huawei Technologies Co., Ltd.
*/
#include <linux/slab.h>
#include <linux/types.h>
#include "internal.h"
const char *stub_name[NR_RA_STUBS] = {
"direct_reclaim",
"drain_all_pages",
"shrink_file_list",
"shrink_anon_list",
"shrink_slab",
};
/* Once initialized, the variable should never be changed */
static bool reclaimacct_is_off = true;
static int reclaimacct_disable = 1;
static void reclaimacct_free(struct reclaim_acct *ra, enum reclaim_type type)
{
memset(ra, 0, sizeof(struct reclaim_acct));
}
static void __reclaimacct_end(struct reclaim_acct *ra, u64 freed,
enum reclaimacct_stubs stub, const struct shrinker *shrinker)
{
u64 now, delay, start;
start = ra->start[stub];
now = ktime_get_ns();
if (now < start)
return;
delay = now - start;
if (delay < DELAY_LV5 || is_system_reclaim(ra->reclaim_type)) {
ra->delay[stub] += delay;
ra->count[stub]++;
ra->freed[stub] += freed;
}
if (delay > DELAY_LV4 && delay < DELAY_LV5) {
pr_warn_ratelimited("%s timeout:%llu\n", stub_name[stub], delay);
if (shrinker)
pr_warn_ratelimited("shrinker = %pF\n", shrinker);
}
}
void reclaimacct_tsk_init(struct task_struct *tsk)
{
if (tsk)
tsk->reclaim_acct = NULL;
}
/* Reinitialize in case parent's non-null pointer was duped */
void reclaimacct_init(void)
{
reclaimacct_tsk_init(&init_task);
}
void reclaimacct_substage_start(enum reclaimacct_stubs stub)
{
if (!current->reclaim_acct)
return;
current->reclaim_acct->start[stub] = ktime_get_ns();
}
void reclaimacct_substage_end(enum reclaimacct_stubs stub, unsigned long freed,
const struct shrinker *shrinker)
{
if (!current->reclaim_acct)
return;
__reclaimacct_end(current->reclaim_acct, freed, stub, shrinker);
}
static void reclaimacct_directreclaim_end(struct reclaim_acct *ra)
{
int i;
if (ra->delay[RA_RECLAIM] > DELAY_LV4) {
pr_warn_ratelimited("Summary");
for (i = 0; i < NR_RA_STUBS; i++)
pr_warn_ratelimited(" %s=%llu %llu", stub_name[i],
ra->delay[i], ra->count[i]);
pr_warn_ratelimited("\n");
}
reclaimacct_collect_data();
reclaimacct_free(ra, ra->reclaim_type);
}
static void reclaimacct_system_reclaim_end(struct reclaim_acct *ra)
{
reclaimacct_free(ra, ra->reclaim_type);
}
void reclaimacct_start(enum reclaim_type type, struct reclaim_acct *ra)
{
if (reclaimacct_disable || reclaimacct_is_off)
return;
if (!current->reclaim_acct)
current->reclaim_acct = ra;
current->reclaim_acct->reclaim_type = type;
current->reclaim_acct->start[RA_RECLAIM] = ktime_get_ns();
}
void reclaimacct_end(enum reclaim_type type)
{
if (!current->reclaim_acct)
return;
__reclaimacct_end(current->reclaim_acct, 0, RA_RECLAIM, NULL);
reclaimacct_collect_reclaim_efficiency();
if (is_system_reclaim(type))
reclaimacct_system_reclaim_end(current->reclaim_acct);
else
reclaimacct_directreclaim_end(current->reclaim_acct);
current->reclaim_acct = NULL;
}
/* Reclaim accounting module initialize */
static int reclaimacct_init_handle(void *p)
{
if (!reclaimacct_initialize_show_data())
goto alloc_show_failed;
reclaimacct_is_off = false;
pr_info("enabled\n");
return 0;
alloc_show_failed:
reclaimacct_is_off = true;
pr_err("disabled\n");
return 0;
}
static int __init reclaimacct_module_init(void)
{
struct task_struct *task = NULL;
task = kthread_run(reclaimacct_init_handle, NULL, "reclaimacct_init");
if (IS_ERR(task))
pr_err("run reclaimacct_init failed\n");
else
pr_info("run reclaimacct_init successfully\n");
return 0;
}
late_initcall(reclaimacct_module_init);
static int reclaimacct_disable_set(const char *val, const struct kernel_param *kp)
{
int ret;
ret = param_set_int(val, kp);
if (ret)
return ret;
if (!reclaimacct_disable)
reclaimacct_reinitialize_show_data();
return 0;
}
static const struct kernel_param_ops reclaimacct_disable_ops = {
.set = reclaimacct_disable_set,
.get = param_get_int,
};
module_param_cb(disable, &reclaimacct_disable_ops, &reclaimacct_disable, 0644);
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