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Subject[PATCH RFC] proc/meminfo: add KernelMisc counter
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Some kernel memory allocations are not accounted anywhere.
This adds easy-read counter for them by subtracting all tracked kinds.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
---
Documentation/filesystems/proc.txt | 2 ++
fs/proc/meminfo.c | 41 +++++++++++++++++++++++++-----------
2 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 66cad5c86171..f11ce167124c 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -891,6 +891,7 @@ VmallocTotal: 112216 kB
VmallocUsed: 428 kB
VmallocChunk: 111088 kB
Percpu: 62080 kB
+KernelMisc: 212856 kB
HardwareCorrupted: 0 kB
AnonHugePages: 49152 kB
ShmemHugePages: 0 kB
@@ -988,6 +989,7 @@ VmallocTotal: total size of vmalloc memory area
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.
+ KernelMisc: All other kinds of kernel memory allocaitons

..............................................................................

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 568d90e17c17..7bc14716fc5d 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -38,15 +38,21 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
long cached;
long available;
unsigned long pages[NR_LRU_LISTS];
- unsigned long sreclaimable, sunreclaim;
+ unsigned long sreclaimable, sunreclaim, misc_reclaimable;
+ unsigned long kernel_stack_kb, page_tables, percpu_pages;
+ unsigned long anon_pages, file_pages, swap_cached;
+ long kernel_misc;
int lru;

si_meminfo(&i);
si_swapinfo(&i);
committed = percpu_counter_read_positive(&vm_committed_as);

- cached = global_node_page_state(NR_FILE_PAGES) -
- total_swapcache_pages() - i.bufferram;
+ anon_pages = global_node_page_state(NR_ANON_MAPPED);
+ file_pages = global_node_page_state(NR_FILE_PAGES);
+ swap_cached = total_swapcache_pages();
+
+ cached = file_pages - swap_cached - i.bufferram;
if (cached < 0)
cached = 0;

@@ -56,13 +62,25 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
available = si_mem_available();
sreclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE);
sunreclaim = global_node_page_state(NR_SLAB_UNRECLAIMABLE);
+ misc_reclaimable = global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
+ kernel_stack_kb = global_zone_page_state(NR_KERNEL_STACK_KB);
+ page_tables = global_zone_page_state(NR_PAGETABLE);
+ percpu_pages = pcpu_nr_pages();
+
+ /* all other kinds of kernel memory allocations */
+ kernel_misc = i.totalram - i.freeram - anon_pages - file_pages
+ - sreclaimable - sunreclaim - misc_reclaimable
+ - (kernel_stack_kb >> (PAGE_SHIFT - 10))
+ - page_tables - percpu_pages;
+ if (kernel_misc < 0)
+ kernel_misc = 0;

show_val_kb(m, "MemTotal: ", i.totalram);
show_val_kb(m, "MemFree: ", i.freeram);
show_val_kb(m, "MemAvailable: ", available);
show_val_kb(m, "Buffers: ", i.bufferram);
show_val_kb(m, "Cached: ", cached);
- show_val_kb(m, "SwapCached: ", total_swapcache_pages());
+ show_val_kb(m, "SwapCached: ", swap_cached);
show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] +
pages[LRU_ACTIVE_FILE]);
show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] +
@@ -92,20 +110,16 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
global_node_page_state(NR_FILE_DIRTY));
show_val_kb(m, "Writeback: ",
global_node_page_state(NR_WRITEBACK));
- show_val_kb(m, "AnonPages: ",
- global_node_page_state(NR_ANON_MAPPED));
+ show_val_kb(m, "AnonPages: ", anon_pages);
show_val_kb(m, "Mapped: ",
global_node_page_state(NR_FILE_MAPPED));
show_val_kb(m, "Shmem: ", i.sharedram);
- show_val_kb(m, "KReclaimable: ", sreclaimable +
- global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
+ show_val_kb(m, "KReclaimable: ", sreclaimable + 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: ",
- global_zone_page_state(NR_PAGETABLE));
+ seq_printf(m, "KernelStack: %8lu kB\n", kernel_stack_kb);
+ show_val_kb(m, "PageTables: ", page_tables);
#ifdef CONFIG_QUICKLIST
show_val_kb(m, "Quicklists: ", quicklist_total_size());
#endif
@@ -122,7 +136,8 @@ 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());
+ show_val_kb(m, "Percpu: ", percpu_pages);
+ show_val_kb(m, "KernelMisc: ", kernel_misc);

#ifdef CONFIG_MEMORY_FAILURE
seq_printf(m, "HardwareCorrupted: %5lu kB\n",
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