Hi,
For long time I've been thought the following equation is correct:
The "MemUsage" is about "Active + Inactive + Slab + PageTables + VmallocUsed" in /proc/meminfo.
(I'm not only the person. See https://bugzilla.redhat.com/show_bug.cgi?id=243657.)
However, some VmallocUsed doesn't really consume MemUsage: ioremap
pages and vmap pages consume just virtual address spaces.
It is a bit helpful for people who want to understand kernel memory
usage to show the number of ioremap and vmap pages in /proc/meminfo.
The following patch adds entries for ioremap and vmap to /proc/meminfo.
Signed-off-by: Masatake YAMATO <[email protected]>
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index b215c35..b888c59 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -19,6 +19,8 @@ static inline void proc_sys_init(void) { }
struct vmalloc_info {
unsigned long used;
+ unsigned long used_as_ioremap;
+ unsigned long used_as_vmap;
unsigned long largest_chunk;
};
@@ -31,6 +33,8 @@ extern void get_vmalloc_info(struct vmalloc_info *vmi);
#define get_vmalloc_info(vmi) \
do { \
(vmi)->used = 0; \
+ (vmi)->used_as_ioremap = 0; \
+ (vmi)->used_as_vmap = 0; \
(vmi)->largest_chunk = 0; \
} while(0)
diff --git a/fs/proc/mmu.c b/fs/proc/mmu.c
index 25d2d9c..5297df2 100644
--- a/fs/proc/mmu.c
+++ b/fs/proc/mmu.c
@@ -38,7 +38,9 @@ void get_vmalloc_info(struct vmalloc_info *vmi)
unsigned long prev_end;
vmi->used = 0;
-
+ vmi->used_as_ioremap = 0;
+ vmi->used_as_vmap = 0;
+
if (!vmlist) {
vmi->largest_chunk = VMALLOC_TOTAL;
}
@@ -51,6 +53,8 @@ void get_vmalloc_info(struct vmalloc_info *vmi)
for (vma = vmlist; vma; vma = vma->next) {
unsigned long addr = (unsigned long) vma->addr;
+ unsigned long flags;
+ unsigned long size;
/*
* Some archs keep another range for modules in vmlist
@@ -59,8 +63,15 @@ void get_vmalloc_info(struct vmalloc_info *vmi)
continue;
if (addr >= VMALLOC_END)
break;
-
- vmi->used += vma->size;
+
+ size = vma->size;
+ flags = vma->flags;
+
+ vmi->used += size;
+ if (flags & VM_IOREMAP)
+ vmi->used_as_ioremap += size;
+ if (flags & VM_MAP)
+ vmi->used_as_vmap += size;
free_area_size = addr - prev_end;
if (vmi->largest_chunk < free_area_size)
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index bee251c..d784c85 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -176,6 +176,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
"Committed_AS: %8lu kB\n"
"VmallocTotal: %8lu kB\n"
"VmallocUsed: %8lu kB\n"
+ "IORemapUsed: %8lu kB\n"
+ "VmapUsed: %8lu kB\n"
"VmallocChunk: %8lu kB\n",
K(i.totalram),
K(i.freeram),
@@ -207,6 +209,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
K(committed),
(unsigned long)VMALLOC_TOTAL >> 10,
vmi.used >> 10,
+ vmi.used_as_ioremap >> 10,
+ vmi.used_as_vmap >> 10,
vmi.largest_chunk >> 10
);
-
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