diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index c8ae7c897f142a329e9f3ac6c496435460ef1c8b..74cec76be9f2c0a336a89756327e43742bd24528 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1245,13 +1245,17 @@ PAGE_SIZE multiple when read back.
This is a simple interface to trigger memory reclaim in the
target cgroup.
- This file accepts a string which contains the number of bytes to
- reclaim.
+ This file accepts a single key, the number of bytes to reclaim.
+ No nested keys are currently supported.
Example::
echo "1G" > memory.reclaim
+ The interface can be later extended with nested keys to
+ configure the reclaim behavior. For example, specify the
+ type of memory to reclaim from (anon, file, ..).
+
Please note that the kernel can over or under reclaim from
the target cgroup. If less bytes are reclaimed than the
specified amount, -EAGAIN is returned.
@@ -1263,13 +1267,6 @@ PAGE_SIZE multiple when read back.
This means that the networking layer will not adapt based on
reclaim induced by memory.reclaim.
- This file also allows the user to specify the nodes to reclaim from,
- via the 'nodes=' key, for example::
-
- echo "1G nodes=0,1" > memory.reclaim
-
- The above instructs the kernel to reclaim memory from nodes 0,1.
-
memory.peak
A read-only single value file which exists on non-root
cgroups.
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 2787b84eaf12f76b9b16059300d7b84d41ddab00..0ceed49516adcc7797d316f550183c8fd9aa8c25 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -418,8 +418,7 @@ extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
unsigned long nr_pages,
gfp_t gfp_mask,
- unsigned int reclaim_options,
- nodemask_t *nodemask);
+ unsigned int reclaim_options);
extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap,
pg_data_t *pgdat,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ab457f0394ab6eeed8bf33c84ee9943586844178..73afff8062f9bf96b17dfae12fbe18091e215cda 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -63,7 +63,6 @@
#include <linux/resume_user_mode.h>
#include <linux/psi.h>
#include <linux/seq_buf.h>
-#include <linux/parser.h>
#include "internal.h"
#include <net/sock.h>
#include <net/ip.h>
@@ -2393,8 +2392,7 @@ static unsigned long reclaim_high(struct mem_cgroup *memcg,
psi_memstall_enter(&pflags);
nr_reclaimed += try_to_free_mem_cgroup_pages(memcg, nr_pages,
gfp_mask,
- MEMCG_RECLAIM_MAY_SWAP,
- NULL);
+ MEMCG_RECLAIM_MAY_SWAP);
psi_memstall_leave(&pflags);
} while ((memcg = parent_mem_cgroup(memcg)) &&
!mem_cgroup_is_root(memcg));
@@ -2685,8 +2683,7 @@ static int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
psi_memstall_enter(&pflags);
nr_reclaimed = try_to_free_mem_cgroup_pages(mem_over_limit, nr_pages,
- gfp_mask, reclaim_options,
- NULL);
+ gfp_mask, reclaim_options);
psi_memstall_leave(&pflags);
if (mem_cgroup_margin(mem_over_limit) >= nr_pages)
@@ -3506,8 +3503,7 @@ static int mem_cgroup_resize_max(struct mem_cgroup *memcg,
}
if (!try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL,
- memsw ? 0 : MEMCG_RECLAIM_MAY_SWAP,
- NULL)) {
+ memsw ? 0 : MEMCG_RECLAIM_MAY_SWAP)) {
ret = -EBUSY;
break;
}
@@ -3618,8 +3614,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
return -EINTR;
if (!try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL,
- MEMCG_RECLAIM_MAY_SWAP,
- NULL))
+ MEMCG_RECLAIM_MAY_SWAP))
nr_retries--;
}
@@ -6429,8 +6424,7 @@ static ssize_t memory_high_write(struct kernfs_open_file *of,
}
reclaimed = try_to_free_mem_cgroup_pages(memcg, nr_pages - high,
- GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP,
- NULL);
+ GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP);
if (!reclaimed && !nr_retries--)
break;
@@ -6479,8 +6473,7 @@ static ssize_t memory_max_write(struct kernfs_open_file *of,
if (nr_reclaims) {
if (!try_to_free_mem_cgroup_pages(memcg, nr_pages - max,
- GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP,
- NULL))
+ GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP))
nr_reclaims--;
continue;
}
@@ -6603,54 +6596,21 @@ static ssize_t memory_oom_group_write(struct kernfs_open_file *of,
return nbytes;
}
-enum {
- MEMORY_RECLAIM_NODES = 0,
- MEMORY_RECLAIM_NULL,
-};
-
-static const match_table_t if_tokens = {
- { MEMORY_RECLAIM_NODES, "nodes=%s" },
- { MEMORY_RECLAIM_NULL, NULL },
-};
-
static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
unsigned int nr_retries = MAX_RECLAIM_RETRIES;
unsigned long nr_to_reclaim, nr_reclaimed = 0;
- unsigned int reclaim_options = MEMCG_RECLAIM_MAY_SWAP |
- MEMCG_RECLAIM_PROACTIVE;
- char *old_buf, *start;
- substring_t args[MAX_OPT_ARGS];
- int token;
- char value[256];
- nodemask_t nodemask = NODE_MASK_ALL;
-
- buf = strstrip(buf);
-
- old_buf = buf;
- nr_to_reclaim = memparse(buf, &buf) / PAGE_SIZE;
- if (buf == old_buf)
- return -EINVAL;
+ unsigned int reclaim_options;
+ int err;
buf = strstrip(buf);
+ err = page_counter_memparse(buf, "", &nr_to_reclaim);
+ if (err)
+ return err;
- while ((start = strsep(&buf, " ")) != NULL) {
- if (!strlen(start))
- continue;
- token = match_token(start, if_tokens, args);
- match_strlcpy(value, args, sizeof(value));
- switch (token) {
- case MEMORY_RECLAIM_NODES:
- if (nodelist_parse(value, nodemask) < 0)
- return -EINVAL;
- break;
- default:
- return -EINVAL;
- }
- }
-
+ reclaim_options = MEMCG_RECLAIM_MAY_SWAP | MEMCG_RECLAIM_PROACTIVE;
while (nr_reclaimed < nr_to_reclaim) {
unsigned long reclaimed;
@@ -6667,8 +6627,7 @@ static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
reclaimed = try_to_free_mem_cgroup_pages(memcg,
nr_to_reclaim - nr_reclaimed,
- GFP_KERNEL, reclaim_options,
- &nodemask);
+ GFP_KERNEL, reclaim_options);
if (!reclaimed && !nr_retries--)
return -EAGAIN;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bd6637fcd8f9b19a69045e79e73d6b0c44d9f15b..e83d2a74e9422b7bd032e6d3b31f804842576208 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -6754,8 +6754,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
unsigned long nr_pages,
gfp_t gfp_mask,
- unsigned int reclaim_options,
- nodemask_t *nodemask)
+ unsigned int reclaim_options)
{
unsigned long nr_reclaimed;
unsigned int noreclaim_flag;
@@ -6770,7 +6769,6 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
.may_unmap = 1,
.may_swap = !!(reclaim_options & MEMCG_RECLAIM_MAY_SWAP),
.proactive = !!(reclaim_options & MEMCG_RECLAIM_PROACTIVE),
- .nodemask = nodemask,
};
/*
* Traverse the ZONELIST_FALLBACK zonelist of the current node to put