/proc/meminfo: add percpu populated pages count

Currently, percpu memory only exposes allocation and utilization
information via debugfs.  This more or less is only really useful for
understanding the fragmentation and allocation information at a per-chunk
level with a few global counters.  This is also gated behind a config.
BPF and cgroup, for example, have seen an increase in use causing
increased use of percpu memory.  Let's make it easier for someone to
identify how much memory is being used.

This patch adds the "Percpu" stat to meminfo to more easily look up how
much percpu memory is in use.  This number includes the cost for all
allocated backing pages and not just insight at the per a unit, per chunk
level.  Metadata is excluded.  I think excluding metadata is fair because
the backing memory scales with the numbere of cpus and can quickly
outweigh the metadata.  It also makes this calculation light.

Link: http://lkml.kernel.org/r/20180807184723.74919-1-dennisszhou@gmail.com
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 1605acbb23b6631f11d4979017e361360c4208a2..22b4b00dee31290bde37b3abc63f4a0807f973cc 100644 (file)
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -870,6 +870,7 @@ Committed_AS:   100056 kB
 VmallocTotal:   112216 kB
 VmallocUsed:       428 kB
 VmallocChunk:   111088 kB
+Percpu:          62080 kB
 HardwareCorrupted:   0 kB
 AnonHugePages:   49152 kB
 ShmemHugePages:      0 kB
@@ -962,6 +963,8 @@ Committed_AS: The amount of memory presently allocated on the system.
 VmallocTotal: total size of vmalloc memory area
  VmallocUsed: amount of vmalloc area which is used
 VmallocChunk: largest contiguous block of vmalloc area which is free
+      Percpu: Memory allocated to the percpu allocator used to back percpu
+              allocations. This stat excludes the cost of metadata.
 
 ..............................................................................
 

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 2fb04846ed11618666be529393732f5d706725d0..edda898714eb7bb23585241dc6631800c6ba1dfb 100644 (file)
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -7,6 +7,7 @@
 #include <linux/mman.h>
 #include <linux/mmzone.h>
 #include <linux/proc_fs.h>
+#include <linux/percpu.h>
 #include <linux/quicklist.h>
 #include <linux/seq_file.h>
 #include <linux/swap.h>
@@ -121,6 +122,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
                   (unsigned long)VMALLOC_TOTAL >> 10);
        show_val_kb(m, "VmallocUsed:    ", 0ul);
        show_val_kb(m, "VmallocChunk:   ", 0ul);
+       show_val_kb(m, "Percpu:         ", pcpu_nr_pages());
 
 #ifdef CONFIG_MEMORY_FAILURE
        seq_printf(m, "HardwareCorrupted: %5lu kB\n",

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 296bbe49d5d18368737e89203cf96d6937f8f016..70b7123f38c7c9044bb262a2cecc96ab415b1f4d 100644 (file)
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -149,4 +149,6 @@ extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
        (typeof(type) __percpu *)__alloc_percpu(sizeof(type),           \
                                                __alignof__(type))
 
+extern unsigned long pcpu_nr_pages(void);
+
 #endif /* __LINUX_PERCPU_H */

diff --git a/mm/percpu.c b/mm/percpu.c
index 0b6480979ac78147d4a3fe33d8aded2d5e9a1a75..a749d4d96e3ec72baa7da9c325230855243e0bfa 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -169,6 +169,14 @@ static LIST_HEAD(pcpu_map_extend_chunks);
  */
 int pcpu_nr_empty_pop_pages;
 
+/*
+ * The number of populated pages in use by the allocator, protected by
+ * pcpu_lock.  This number is kept per a unit per chunk (i.e. when a page gets
+ * allocated/deallocated, it is allocated/deallocated in all units of a chunk
+ * and increments/decrements this count by 1).
+ */
+static unsigned long pcpu_nr_populated;
+
 /*
  * Balance work is used to populate or destroy chunks asynchronously.  We
  * try to keep the number of populated free pages between
@@ -1232,6 +1240,7 @@ static void pcpu_chunk_populated(struct pcpu_chunk *chunk, int page_start,
 
        bitmap_set(chunk->populated, page_start, nr);
        chunk->nr_populated += nr;
+       pcpu_nr_populated += nr;
 
        if (!for_alloc) {
                chunk->nr_empty_pop_pages += nr;
@@ -1260,6 +1269,7 @@ static void pcpu_chunk_depopulated(struct pcpu_chunk *chunk,
        chunk->nr_populated -= nr;
        chunk->nr_empty_pop_pages -= nr;
        pcpu_nr_empty_pop_pages -= nr;
+       pcpu_nr_populated -= nr;
 }
 
 /*
@@ -2176,6 +2186,9 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
        pcpu_nr_empty_pop_pages = pcpu_first_chunk->nr_empty_pop_pages;
        pcpu_chunk_relocate(pcpu_first_chunk, -1);
 
+       /* include all regions of the first chunk */
+       pcpu_nr_populated += PFN_DOWN(size_sum);
+
        pcpu_stats_chunk_alloc();
        trace_percpu_create_chunk(base_addr);
 
@@ -2745,6 +2758,22 @@ void __init setup_per_cpu_areas(void)
 
 #endif /* CONFIG_SMP */
 
+/*
+ * pcpu_nr_pages - calculate total number of populated backing pages
+ *
+ * This reflects the number of pages populated to back chunks.  Metadata is
+ * excluded in the number exposed in meminfo as the number of backing pages
+ * scales with the number of cpus and can quickly outweigh the memory used for
+ * metadata.  It also keeps this calculation nice and simple.
+ *
+ * RETURNS:
+ * Total number of populated backing pages in use by the allocator.
+ */
+unsigned long pcpu_nr_pages(void)
+{
+       return pcpu_nr_populated * pcpu_nr_units;
+}
+
 /*
  * Percpu allocator is initialized early during boot when neither slab or
  * workqueue is available.  Plug async management until everything is up