The patch titled
Subject: mm, proc: add KReclaimable to /proc/meminfo
has been added to the -mm tree. Its filename is
mm-proc-add-kreclaimable-to-proc-meminfo.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-proc-add-kreclaimable-to-proc-meminfo.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-proc-add-kreclaimable-to-proc-meminfo.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, proc: add KReclaimable to /proc/meminfo
The vmstat NR_KERNEL_MISC_RECLAIMABLE counter is for kernel non-slab
allocations that can be reclaimed via shrinker. In /proc/meminfo, we can
show the sum of all reclaimable kernel allocations (including slab) as
"KReclaimable". Add the same counter also to per-node meminfo under /sys
With this counter, users will have more complete information about kernel
memory usage. Non-slab reclaimable pages (currently just the ION
allocator) will not be missing from /proc/meminfo, making users wonder
where part of their memory went. More precisely, they already appear in
MemAvailable, but without the new counter, it's not obvious why the value
in MemAvailable doesn't fully correspond with the sum of other counters
participating in it.
Link: http://lkml.kernel.org/r/20180731090649.16028-6-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Roman Gushchin <guro@xxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Vijayanand Jitta <vjitta@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 4 ++++
drivers/base/node.c | 19 ++++++++++++-------
fs/proc/meminfo.c | 16 ++++++++--------
3 files changed, 24 insertions(+), 15 deletions(-)
--- a/Documentation/filesystems/proc.txt~mm-proc-add-kreclaimable-to-proc-meminfo
+++ a/Documentation/filesystems/proc.txt
@@ -858,6 +858,7 @@ Writeback: 0 kB
AnonPages: 861800 kB
Mapped: 280372 kB
Shmem: 644 kB
+KReclaimable: 168048 kB
Slab: 284364 kB
SReclaimable: 159856 kB
SUnreclaim: 124508 kB
@@ -925,6 +926,9 @@ AnonHugePages: Non-file backed huge page
ShmemHugePages: Memory used by shared memory (shmem) and tmpfs allocated
with huge pages
ShmemPmdMapped: Shared memory mapped into userspace with huge pages
+KReclaimable: Kernel allocations that the kernel will attempt to reclaim
+ under memory pressure. Includes SReclaimable (below), and other
+ direct allocations with a shrinker.
Slab: in-kernel data structures cache
SReclaimable: Part of Slab, that might be reclaimed, such as caches
SUnreclaim: Part of Slab, that cannot be reclaimed on memory pressure
--- a/drivers/base/node.c~mm-proc-add-kreclaimable-to-proc-meminfo
+++ a/drivers/base/node.c
@@ -67,8 +67,11 @@ static ssize_t node_read_meminfo(struct
int nid = dev->id;
struct pglist_data *pgdat = NODE_DATA(nid);
struct sysinfo i;
+ unsigned long sreclaimable, sunreclaimable;
si_meminfo_node(&i, nid);
+ sreclaimable = node_page_state(pgdat, NR_SLAB_RECLAIMABLE);
+ sunreclaimable = node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE);
n = sprintf(buf,
"Node %d MemTotal: %8lu kB\n"
"Node %d MemFree: %8lu kB\n"
@@ -118,6 +121,7 @@ static ssize_t node_read_meminfo(struct
"Node %d NFS_Unstable: %8lu kB\n"
"Node %d Bounce: %8lu kB\n"
"Node %d WritebackTmp: %8lu kB\n"
+ "Node %d KReclaimable: %8lu kB\n"
"Node %d Slab: %8lu kB\n"
"Node %d SReclaimable: %8lu kB\n"
"Node %d SUnreclaim: %8lu kB\n"
@@ -138,20 +142,21 @@ static ssize_t node_read_meminfo(struct
nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
- nid, K(node_page_state(pgdat, NR_SLAB_RECLAIMABLE) +
- node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)),
- nid, K(node_page_state(pgdat, NR_SLAB_RECLAIMABLE)),
+ nid, K(sreclaimable +
+ node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
+ nid, K(sreclaimable + sunreclaimable),
+ nid, K(sreclaimable),
+ nid, K(sunreclaimable)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- nid, K(node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)),
+ ,
nid, K(node_page_state(pgdat, NR_ANON_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
HPAGE_PMD_NR),
nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
- HPAGE_PMD_NR));
-#else
- nid, K(node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE)));
+ HPAGE_PMD_NR)
#endif
+ );
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
}
--- a/fs/proc/meminfo.c~mm-proc-add-kreclaimable-to-proc-meminfo
+++ a/fs/proc/meminfo.c
@@ -38,6 +38,7 @@ static int meminfo_proc_show(struct seq_
long cached;
long available;
unsigned long pages[NR_LRU_LISTS];
+ unsigned long sreclaimable, sunreclaim;
int lru;
si_meminfo(&i);
@@ -53,6 +54,8 @@ static int meminfo_proc_show(struct seq_
pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
available = si_mem_available();
+ sreclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE);
+ sunreclaim = global_node_page_state(NR_SLAB_UNRECLAIMABLE);
show_val_kb(m, "MemTotal: ", i.totalram);
show_val_kb(m, "MemFree: ", i.freeram);
@@ -94,14 +97,11 @@ static int meminfo_proc_show(struct seq_
show_val_kb(m, "Mapped: ",
global_node_page_state(NR_FILE_MAPPED));
show_val_kb(m, "Shmem: ", i.sharedram);
- show_val_kb(m, "Slab: ",
- global_node_page_state(NR_SLAB_RECLAIMABLE) +
- global_node_page_state(NR_SLAB_UNRECLAIMABLE));
-
- show_val_kb(m, "SReclaimable: ",
- global_node_page_state(NR_SLAB_RECLAIMABLE));
- show_val_kb(m, "SUnreclaim: ",
- global_node_page_state(NR_SLAB_UNRECLAIMABLE));
+ show_val_kb(m, "KReclaimable: ", sreclaimable +
+ global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
+ show_val_kb(m, "Slab: ", sreclaimable + sunreclaim);
+ show_val_kb(m, "SReclaimable: ", sreclaimable);
+ show_val_kb(m, "SUnreclaim: ", sunreclaim);
seq_printf(m, "KernelStack: %8lu kB\n",
global_zone_page_state(NR_KERNEL_STACK_KB));
show_val_kb(m, "PageTables: ",
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-slab-combine-kmalloc_caches-and-kmalloc_dma_caches.patch
mm-slab-slub-introduce-kmalloc-reclaimable-caches.patch
dcache-allocate-external-names-from-reclaimable-kmalloc-caches.patch
mm-rename-and-change-semantics-of-nr_indirectly_reclaimable_bytes.patch
mm-proc-add-kreclaimable-to-proc-meminfo.patch
mm-slab-shorten-kmalloc-cache-names-for-large-sizes.patch
