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taskstats: add support for system stats

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Add a new command to get system wide information from
userspace. This patch adds system command to export
memory statistics.

Change-Id: I20c1c24f49024f49b21e3d8e88799559fb5b2058
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
[guptap@codeaurora.org: rename nr_indirectly_reclaimable_bytes]
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
This commit is contained in:
Vinayak Menon 2019-02-11 14:03:50 +05:30 committed by Prakash Gupta
parent efa5ce2c9a
commit 5a5b186dfb
4 changed files with 251 additions and 0 deletions
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1
gen_headers_arm.bp
View File

@ -545,6 +545,7 @@ gen_headers_out_arm = [
"linux/synclink.h",
"linux/sysctl.h",
"linux/sysinfo.h",
"linux/sysstats.h",
"linux/target_core_user.h",
"linux/taskstats.h",
"linux/tcp.h",

1
gen_headers_arm64.bp
View File

@ -540,6 +540,7 @@ gen_headers_out_arm64 = [
"linux/synclink.h",
"linux/sysctl.h",
"linux/sysinfo.h",
"linux/sysstats.h",
"linux/target_core_user.h",
"linux/taskstats.h",
"linux/tcp.h",

94
include/uapi/linux/sysstats.h Normal file
View File

@ -0,0 +1,94 @@
/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
/*
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*/
#ifndef _LINUX_SYSSTATS_H
#define _LINUX_SYSSTATS_H
#include <linux/types.h>
#include <linux/taskstats.h>
#include <linux/cgroupstats.h>
#define SYSSTATS_VERSION 1
/*
* Data shared between user space and kernel space
* Each member is aligned to a 8 byte boundary.
* All values in KB.
*/
struct sys_memstats {
__u64 version;
__u64 memtotal;
__u64 vmalloc_total;
__u64 reclaimable;
__u64 zram_compressed;
__u64 swap_used;
__u64 swap_total;
#ifdef CONFIG_MM_STAT_UNRECLAIMABLE_PAGES
__u64 unreclaimable;
#endif
__u64 buffer;
__u64 slab_reclaimable;
__u64 slab_unreclaimable;
__u64 free_cma;
__u64 file_mapped;
__u64 swapcache;
__u64 pagetable;
__u64 kernelstack;
__u64 shmem;
__u64 dma_nr_free_pages;
__u64 dma_nr_active_anon;
__u64 dma_nr_inactive_anon;
__u64 dma_nr_active_file;
__u64 dma_nr_inactive_file;
__u64 normal_nr_free_pages;
__u64 normal_nr_active_anon;
__u64 normal_nr_inactive_anon;
__u64 normal_nr_active_file;
__u64 normal_nr_inactive_file;
__u64 movable_nr_free_pages;
__u64 movable_nr_active_anon;
__u64 movable_nr_inactive_anon;
__u64 movable_nr_active_file;
__u64 movable_nr_inactive_file;
__u64 highmem_nr_free_pages;
__u64 highmem_nr_active_anon;
__u64 highmem_nr_inactive_anon;
__u64 highmem_nr_active_file;
__u64 highmem_nr_inactive_file;
/* version 1 ends here */
};
/*
* Commands sent from userspace
* Not versioned. New commands should only be inserted at the enum's end.
*/
enum {
SYSSTATS_CMD_UNSPEC = __CGROUPSTATS_CMD_MAX, /* Reserved */
SYSSTATS_CMD_GET, /* user->kernel request/get-response */
SYSSTATS_CMD_NEW, /* kernel->user event */
};
#define SYSSTATS_CMD_UNSPEC SYSSTATS_CMD_UNSPEC
#define SYSSTATS_CMD_GET SYSSTATS_CMD_GET
#define SYSSTATS_CMD_NEW SYSSTATS_CMD_NEW
enum {
SYSSTATS_TYPE_UNSPEC = 0, /* Reserved */
SYSSTATS_TYPE_SYSMEM_STATS, /* contains name + memory stats */
};
#define SYSSTATS_TYPE_UNSPEC SYSSTATS_TYPE_UNSPEC
#define SYSSTATS_TYPE_SYSMEM_STATS SYSSTATS_TYPE_SYSMEM_STATS
enum {
SYSSTATS_CMD_ATTR_UNSPEC = 0,
SYSSTATS_CMD_ATTR_SYSMEM_STATS,
};
#define SYSSTATS_CMD_ATTR_UNSPEC SYSSTATS_CMD_ATTR_UNSPEC
#define SYSSTATS_CMD_ATTR_SYSMEM_STATS SYSSTATS_CMD_ATTR_SYSMEM_STATS
#endif /* _LINUX_SYSSTATS_H */

155
kernel/taskstats.c
View File

@ -13,7 +13,10 @@
#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>
@ -48,6 +51,11 @@ static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX
[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;
@ -386,6 +394,144 @@ 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 =
global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE) >> 10;
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));
#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;
@ -659,6 +805,12 @@ static const struct genl_ops taskstats_ops[] = {
/* 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,
@ -673,6 +825,9 @@ static int taskstats_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
case CGROUPSTATS_CMD_GET:
policy = cgroupstats_cmd_get_policy;
break;
case SYSSTATS_CMD_GET:
policy = sysstats_cmd_get_policy;
break;
default:
return -EINVAL;
}