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Subject[PATCH] add vmalloc stats to meminfo
Some workloads like to eat up a lot of vmalloc space.  It is often hard to tell
whether this is because the area is too small, or just too fragmented. This
makes it easy to determine.

--
Dave Hansen
haveblue@us.ibm.com

diff -ur linux-2.5.34-mm4/fs/proc/proc_misc.c linux-2.5.34-mm4-vmalloc-stats/fs/proc/proc_misc.c
--- linux-2.5.34-mm4/fs/proc/proc_misc.c Sat Sep 14 21:23:54 2002
+++ linux-2.5.34-mm4-vmalloc-stats/fs/proc/proc_misc.c Sat Sep 14 22:38:12 2002
@@ -38,6 +38,7 @@
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/times.h>
+#include <linux/vmalloc.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -128,6 +129,40 @@
return proc_calc_metrics(page, start, off, count, eof, len);
}

+struct vmalloc_info {
+ unsigned long used;
+ unsigned long largest_chunk;
+};
+
+static struct vmalloc_info get_vmalloc_info(void)
+{
+ unsigned long prev_end = VMALLOC_START;
+ struct vm_struct* vma;
+ struct vmalloc_info vmi;
+ vmi.used = 0;
+
+ read_lock(&vmlist_lock);
+
+ if(!vmlist)
+ vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
+ else
+ vmi.largest_chunk = 0;
+
+ for (vma = vmlist; vma; vma = vma->next) {
+ unsigned long free_area_size =
+ (unsigned long)vma->addr - prev_end;
+ vmi.used += vma->size;
+ if (vmi.largest_chunk < free_area_size )
+ vmi.largest_chunk = free_area_size;
+ prev_end = vma->size + (unsigned long)vma->addr;
+ }
+ if(VMALLOC_END-prev_end > vmi.largest_chunk)
+ vmi.largest_chunk = VMALLOC_END-prev_end;
+
+ read_unlock(&vmlist_lock);
+ return vmi;
+}
+
extern atomic_t vm_committed_space;

static int meminfo_read_proc(char *page, char **start, off_t off,
@@ -138,6 +173,8 @@
struct page_state ps;
unsigned long inactive;
unsigned long active;
+ unsigned long vmtot;
+ struct vmalloc_info vmi;

get_page_state(&ps);
get_zone_counts(&active, &inactive);
@@ -150,6 +187,11 @@
si_swapinfo(&i);
committed = atomic_read(&vm_committed_space);

+ vmtot = (VMALLOC_END-VMALLOC_START)>>10;
+ vmi = get_vmalloc_info();
+ vmi.used >>= 10;
+ vmi.largest_chunk >>= 10;
+
/*
* Tagged format, for easy grepping and expansion.
*/
@@ -174,7 +216,10 @@
"Slab: %8lu kB\n"
"Committed_AS: %8u kB\n"
"PageTables: %8lu kB\n"
- "ReverseMaps: %8lu\n",
+ "ReverseMaps: %8lu\n"
+ "VmalTotal: %8lu kB\n"
+ "VmalUsed: %8lu kB\n"
+ "VmalChunk: %8lu kB\n",
K(i.totalram),
K(i.freeram),
K(i.sharedram),
@@ -195,7 +240,10 @@
K(ps.nr_slab),
K(committed),
K(ps.nr_page_table_pages),
- ps.nr_reverse_maps
+ ps.nr_reverse_maps,
+ vmtot,
+ vmi.used,
+ vmi.largest_chunk
);

#ifdef CONFIG_HUGETLB_PAGE
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