cgroup and namespaces are used for creating containers but some of
information is not isolated/virtualized. This patch is for isolating /proc/meminfo
information per container, which uses memory cgroup. By this, top,free
and other tools under container can work as expected(show container's
usage) without changes.
This patch is a trial to show memcg's info in /proc/meminfo if 'current'
is under a memcg other than root.
we show /proc/meminfo base on container's memory cgroup.
because there are lots of info can't be provide by memcg, and
the cmds such as top, free just use some entries of /proc/meminfo,
we replace those entries by memory cgroup.
if container has no memcg, we will show host's /proc/meminfo
as before.
there is no idea how to deal with Buffers,I just set it zero,
It's strange if Buffers bigger than MemTotal.
Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
---
fs/proc/meminfo.c | 11 +++++---
include/linux/memcontrol.h | 15 +++++++++++
mm/memcontrol.c | 56 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 78 insertions(+), 4 deletions(-)
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 80e4645..29a1fcd 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -13,6 +13,7 @@
#include <linux/atomic.h>
#include <asm/page.h>
#include <asm/pgtable.h>
+#include <linux/memcontrol.h>
#include "internal.h"
void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
@@ -27,7 +28,6 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
struct vmalloc_info vmi;
long cached;
unsigned long pages[NR_LRU_LISTS];
- int lru;
/*
* display in kilobytes.
@@ -39,16 +39,19 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
allowed = ((totalram_pages - hugetlb_total_pages())
* sysctl_overcommit_ratio / 100) + total_swap_pages;
+ memcg_meminfo(&i);
cached = global_page_state(NR_FILE_PAGES) -
total_swapcache_pages - i.bufferram;
+ /*
+ * If 'current' is in root memory cgroup, returns global status.
+ * If not, returns the status of memcg under which current runs.
+ */
+ sys_page_state(pages, &cached);
if (cached < 0)
cached = 0;
get_vmalloc_info(&vmi);
- for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
- pages[lru] = global_page_state(NR_LRU_BASE + lru);
-
/*
* Tagged format, for easy grepping and expansion.
*/
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0316197..6220764 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -21,6 +21,7 @@
#define _LINUX_MEMCONTROL_H
#include <linux/cgroup.h>
#include <linux/vm_event_item.h>
+#include <linux/mm.h>
struct mem_cgroup;
struct page_cgroup;
@@ -116,6 +117,9 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *,
struct mem_cgroup_reclaim_cookie *);
void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
+extern void memcg_meminfo(struct sysinfo *si);
+extern void sys_page_state(unsigned long *page, long *cached);
+
/*
* For memory reclaim.
*/
@@ -323,6 +327,17 @@ static inline void mem_cgroup_iter_break(struct mem_cgroup *root,
{
}
+static inline void memcg_meminfo(struct sysinfo *si)
+{
+}
+
+static inline void sys_page_state(unsigned long *pages, long *cached)
+{
+ int lru;
+ for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+ pages[lru] = global_page_state(NR_LRU_BASE + lru);
+}
+
static inline bool mem_cgroup_disabled(void)
{
return true;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f142ea9..c25e160 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -52,6 +52,7 @@
#include "internal.h"
#include <net/sock.h>
#include <net/tcp_memcontrol.h>
+#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
@@ -4345,6 +4346,61 @@ mem_cgroup_get_total_stat(struct mem_cgroup *memcg, struct mcs_total_stat *s)
mem_cgroup_get_local_stat(iter, s);
}
+void memcg_meminfo(struct sysinfo *val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_task(current);
+ __kernel_ulong_t totalram, totalswap;
+ if (current->nsproxy->pid_ns == &init_pid_ns ||
+ memcg == NULL || mem_cgroup_is_root(memcg))
+ return;
+
+ totalram = res_counter_read_u64(&memcg->res,
+ RES_LIMIT) >> PAGE_SHIFT;
+ if (totalram < val->totalram) {
+ __kernel_ulong_t usageram;
+ usageram = res_counter_read_u64(&memcg->res,
+ RES_USAGE) >> PAGE_SHIFT;
+ val->totalram = totalram;
+ val->freeram = totalram - usageram;
+ val->bufferram = 0;
+ val->totalhigh = 0;
+ val->freehigh = 0;
+ } else
+ return;
+
+ totalswap = res_counter_read_u64(&memcg->memsw,
+ RES_LIMIT) >> PAGE_SHIFT;
+ if (totalswap < val->totalswap) {
+ __kernel_ulong_t usageswap;
+ usageswap = res_counter_read_u64(&memcg->memsw,
+ RES_USAGE) >> PAGE_SHIFT;
+ val->totalswap = totalswap - val->totalram;
+ val->freeswap = totalswap - usageswap - val->freeram;
+ }
+}
+
+void sys_page_state(unsigned long *pages, long *cached)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_task(current);
+
+ if (current->nsproxy->pid_ns == &init_pid_ns ||
+ memcg == NULL || mem_cgroup_is_root(memcg)) {
+ int lru;
+ for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+ pages[lru] = global_page_state(NR_LRU_BASE + lru);
+ } else {
+ struct mcs_total_stat s;
+ memset(&s, 0, sizeof(s));
+ mem_cgroup_get_total_stat(memcg, &s);
+ *cached = s.stat[MCS_CACHE] >> PAGE_SHIFT;
+ pages[LRU_ACTIVE_ANON] = s.stat[MCS_ACTIVE_ANON] >> PAGE_SHIFT;
+ pages[LRU_ACTIVE_FILE] = s.stat[MCS_ACTIVE_FILE] >> PAGE_SHIFT;
+ pages[LRU_INACTIVE_ANON] = s.stat[MCS_INACTIVE_ANON] >> PAGE_SHIFT;
+ pages[LRU_INACTIVE_FILE] = s.stat[MCS_INACTIVE_FILE] >> PAGE_SHIFT;
+ pages[LRU_UNEVICTABLE] = s.stat[MCS_UNEVICTABLE] >> PAGE_SHIFT;
+ }
+}
+
#ifdef CONFIG_NUMA
static int mem_control_numa_stat_show(struct seq_file *m, void *arg)
{
--
1.7.7.6
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