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authorChris Down <chris@chrisdown.name>2019-03-06 00:45:55 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-06 06:07:17 +0100
commit677dc9731b54dccaaadbdcea18f8eecc95cee832 (patch)
tree21784f11d6078f396b4c79b0b4221ae5f23b0555 /mm
parentmm, memcg: create mem_cgroup_from_seq (diff)
downloadlinux-677dc9731b54dccaaadbdcea18f8eecc95cee832.tar.xz
linux-677dc9731b54dccaaadbdcea18f8eecc95cee832.zip
mm, memcg: extract memcg maxable seq_file logic to seq_show_memcg_tunable
memcg has a significant number of files exposed to kernfs where their value is either exposed directly or is "max" in the case of PAGE_COUNTER_MAX. This patch makes this generic by providing a single function to do this work. In combination with the previous patch adding mem_cgroup_from_seq, this makes all of the seq_show feeder functions significantly more simple. Link: http://lkml.kernel.org/r/20190124194100.GA31425@chrisdown.name Signed-off-by: Chris Down <chris@chrisdown.name> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Roman Gushchin <guro@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c64
1 files changed, 19 insertions, 45 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 027abf9935d0..59425a35763c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5353,6 +5353,16 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css)
root_mem_cgroup->use_hierarchy = false;
}
+static int seq_puts_memcg_tunable(struct seq_file *m, unsigned long value)
+{
+ if (value == PAGE_COUNTER_MAX)
+ seq_puts(m, "max\n");
+ else
+ seq_printf(m, "%llu\n", (u64)value * PAGE_SIZE);
+
+ return 0;
+}
+
static u64 memory_current_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{
@@ -5363,15 +5373,8 @@ static u64 memory_current_read(struct cgroup_subsys_state *css,
static int memory_min_show(struct seq_file *m, void *v)
{
- struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- unsigned long min = READ_ONCE(memcg->memory.min);
-
- if (min == PAGE_COUNTER_MAX)
- seq_puts(m, "max\n");
- else
- seq_printf(m, "%llu\n", (u64)min * PAGE_SIZE);
-
- return 0;
+ return seq_puts_memcg_tunable(m,
+ READ_ONCE(mem_cgroup_from_seq(m)->memory.min));
}
static ssize_t memory_min_write(struct kernfs_open_file *of,
@@ -5393,15 +5396,8 @@ static ssize_t memory_min_write(struct kernfs_open_file *of,
static int memory_low_show(struct seq_file *m, void *v)
{
- struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- unsigned long low = READ_ONCE(memcg->memory.low);
-
- if (low == PAGE_COUNTER_MAX)
- seq_puts(m, "max\n");
- else
- seq_printf(m, "%llu\n", (u64)low * PAGE_SIZE);
-
- return 0;
+ return seq_puts_memcg_tunable(m,
+ READ_ONCE(mem_cgroup_from_seq(m)->memory.low));
}
static ssize_t memory_low_write(struct kernfs_open_file *of,
@@ -5423,15 +5419,7 @@ static ssize_t memory_low_write(struct kernfs_open_file *of,
static int memory_high_show(struct seq_file *m, void *v)
{
- struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- unsigned long high = READ_ONCE(memcg->high);
-
- if (high == PAGE_COUNTER_MAX)
- seq_puts(m, "max\n");
- else
- seq_printf(m, "%llu\n", (u64)high * PAGE_SIZE);
-
- return 0;
+ return seq_puts_memcg_tunable(m, READ_ONCE(mem_cgroup_from_seq(m)->high));
}
static ssize_t memory_high_write(struct kernfs_open_file *of,
@@ -5460,15 +5448,8 @@ static ssize_t memory_high_write(struct kernfs_open_file *of,
static int memory_max_show(struct seq_file *m, void *v)
{
- struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- unsigned long max = READ_ONCE(memcg->memory.max);
-
- if (max == PAGE_COUNTER_MAX)
- seq_puts(m, "max\n");
- else
- seq_printf(m, "%llu\n", (u64)max * PAGE_SIZE);
-
- return 0;
+ return seq_puts_memcg_tunable(m,
+ READ_ONCE(mem_cgroup_from_seq(m)->memory.max));
}
static ssize_t memory_max_write(struct kernfs_open_file *of,
@@ -6600,15 +6581,8 @@ static u64 swap_current_read(struct cgroup_subsys_state *css,
static int swap_max_show(struct seq_file *m, void *v)
{
- struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
- unsigned long max = READ_ONCE(memcg->swap.max);
-
- if (max == PAGE_COUNTER_MAX)
- seq_puts(m, "max\n");
- else
- seq_printf(m, "%llu\n", (u64)max * PAGE_SIZE);
-
- return 0;
+ return seq_puts_memcg_tunable(m,
+ READ_ONCE(mem_cgroup_from_seq(m)->swap.max));
}
static ssize_t swap_max_write(struct kernfs_open_file *of,