[MODSLAB 2.5/4] A slab statistics module

From: Christoph Lameter
Date: Sun Aug 27 2006 - 03:15:48 EST

I missed a patch. Insert this patch into the patchset after the slabifier
patch

Generic Slab statistics module

A statistic module for generic slab allocator framework.

The creator of a cache must register the slab cache with

register_slab()

in order for something to show up in slabinfo.

Here is a sample of slabinfo output:

slabinfo - version: 3.0
# name <objects> <objsize> <num_slabs> <partial_slabs> <active_slabs> <order> <allocator>
nfs_direct_cache 0 136 0 0 0 0 reclaimable:page_allocator
nfs_write_data 36 896 2 0 0 0 unreclaimable:page_allocator
nfs_read_data 21 768 2 1 0 0 unreclaimable:page_allocator
nfs_inode_cache 17 1032 3 3 0 0 ctor_dtor:reclaimable:page_allocator
rpc_tasks 0 384 1 1 0 0 unreclaimable:page_allocator
rpc_inode_cache 0 896 1 1 0 0 ctor_dtor:reclaimable:page_allocator
ip6_dst_cache 0 384 1 1 0 0 unreclaimable:page_allocator
TCPv6 1 1792 2 2 0 0 unreclaimable:page_allocator
UNIX 112 768 11 7 0 0 unreclaimable:page_allocator
dm_tio 0 24 0 0 0 0 unreclaimable:page_allocator
dm_io 0 40 0 0 0 0 unreclaimable:page_allocator
kmalloc 0 64 0 0 0 0 dma:unreclaimable:page_allocator
cfq_ioc_pool 0 160 0 0 0 0 unreclaimable:page_allocator
cfq_pool 0 160 0 0 0 0 unreclaimable:page_allocator
mqueue_inode_cache 0 896 1 1 0 0 ctor_dtor:unreclaimable:page_allocator
xfs_chashlist 822 40 9 9 0 0 unreclaimable:page_allocator
xfs_ili 183 192 9 8 1 0 unreclaimable:page_allocator
xfs_inode 7890 640 319 6 1 0 reclaimable:page_allocator
xfs_efi_item 0 352 0 0 0 0 unreclaimable:page_allocator
xfs_efd_item 0 360 0 0 0 0 unreclaimable:page_allocator
xfs_buf_item 4 184 1 0 1 0 unreclaimable:page_allocator
xfs_acl 0 304 0 0 0 0 unreclaimable:page_allocator
xfs_dabuf 0 24 1 0 1 0 unreclaimable:page_allocator
xfs_da_state 0 488 0 0 0 0 unreclaimable:page_allocator
xfs_trans 1 832 1 0 1 0 unreclaimable:page_allocator
xfs_btree_cur 0 192 1 0 1 0 unreclaimable:page_allocator
xfs_bmap_free_item 0 24 0 0 0 0 unreclaimable:page_allocator
xfs_ioend 128 160 2 0 1 0 unreclaimable:page_allocator
xfs_vnode 7891 768 380 5 1 0 ctor_dtor:reclaimable:page_allocator
isofs_inode_cache 0 656 0 0 0 0 ctor_dtor:reclaimable:page_allocator
fat_inode_cache 0 688 1 1 0 0 ctor_dtor:reclaimable:page_allocator
fat_cache 0 40 0 0 0 0 ctor_dtor:reclaimable:page_allocator
hugetlbfs_inode_cache 0 624 1 1 0 0 ctor_dtor:unreclaimable:page_allocator
ext2_inode_cache 0 776 0 0 0 0 ctor_dtor:reclaimable:page_allocator
ext2_xattr 0 88 0 0 0 0 reclaimable:page_allocator
journal_handle 0 24 0 0 0 0 unreclaimable:page_allocator
journal_head 0 96 0 0 0 0 unreclaimable:page_allocator
ext3_inode_cache 0 824 0 0 0 0 ctor_dtor:reclaimable:page_allocator
ext3_xattr 0 88 0 0 0 0 reclaimable:page_allocator
reiser_inode_cache 0 736 0 0 0 0 ctor_dtor:reclaimable:page_allocator
dnotify_cache 0 40 0 0 0 0 unreclaimable:page_allocator
dquot 0 256 0 0 0 0 reclaimable:page_allocator
eventpoll_pwq 0 72 1 1 0 0 unreclaimable:page_allocator
inotify_event_cache 0 40 0 0 0 0 unreclaimable:page_allocator
inotify_watch_cache 0 72 1 1 0 0 unreclaimable:page_allocator
kioctx 0 384 0 0 0 0 unreclaimable:page_allocator
fasync_cache 0 24 0 0 0 0 unreclaimable:page_allocator
shmem_inode_cache 794 816 45 12 0 0 ctor_dtor:unreclaimable:page_allocator
posix_timers_cache 0 136 0 0 0 0 unreclaimable:page_allocator
partial_page_cache 0 48 0 0 0 0 unreclaimable:page_allocator
xfrm_dst_cache 0 384 0 0 0 0 unreclaimable:page_allocator
ip_dst_cache 21 384 2 2 0 0 unreclaimable:page_allocator
RAW 0 896 1 1 0 0 unreclaimable:page_allocator
UDP 3 896 3 2 1 0 unreclaimable:page_allocator
TCP 12 1664 4 4 0 0 unreclaimable:page_allocator
scsi_io_context 0 112 0 0 0 0 unreclaimable:page_allocator
blkdev_ioc 26 56 7 7 0 0 unreclaimable:page_allocator
blkdev_queue 24 1616 4 2 0 0 unreclaimable:page_allocator
blkdev_requests 12 280 2 0 2 0 unreclaimable:page_allocator
sock_inode_cache 167 768 12 6 1 0 ctor_dtor:reclaimable:page_allocator
file_lock_cache 1 184 2 2 0 0 ctor_dtor:unreclaimable:page_allocator
Acpi-Parse 0 40 0 0 0 0 unreclaimable:page_allocator
Acpi-State 0 80 0 0 0 0 unreclaimable:page_allocator
proc_inode_cache 696 640 36 16 1 0 ctor_dtor:reclaimable:page_allocator
sigqueue 0 160 4 0 4 0 unreclaimable:page_allocator
radix_tree_node 2068 560 75 5 0 0 ctor_dtor:unreclaimable:page_allocator
bdev_cache 42 896 5 4 0 0 ctor_dtor:reclaimable:page_allocator
sysfs_dir_cache 4283 80 24 4 0 0 unreclaimable:page_allocator
inode_cache 2571 608 103 8 1 0 ctor_dtor:reclaimable:page_allocator
dentry_cache 13014 200 166 7 3 0 reclaimable:page_allocator
idr_layer_cache 76 536 4 2 0 0 ctor_dtor:unreclaimable:page_allocator
buffer_head 4417 104 33 9 0 0 ctor_dtor:reclaimable:page_allocator
vm_area_struct 1503 176 24 19 3 0 unreclaimable:page_allocator
files_cache 47 768 7 6 1 0 unreclaimable:page_allocator
signal_cache 136 640 10 6 1 0 unreclaimable:page_allocator
sighand_cache 136 1664 19 6 1 0 ctor_dtor:rcu:unreclaimable:page_allocator
anon_vma 264 32 9 8 1 0 ctor_dtor:rcu:unreclaimable:page_allocator
shared_policy_node 0 48 0 0 0 0 unreclaimable:page_allocator
numa_policy 85 264 4 3 0 0 unreclaimable:page_allocator
kmalloc 0 262144 0 0 0 4 unreclaimable:page_allocator
kmalloc 2 131072 2 0 0 3 unreclaimable:page_allocator
kmalloc 1 65536 1 0 0 2 unreclaimable:page_allocator
kmalloc 10 32768 10 0 0 1 unreclaimable:page_allocator
kmalloc 93 16384 93 0 0 0 unreclaimable:page_allocator
kmalloc 98 8192 49 0 0 0 unreclaimable:page_allocator
kmalloc 99 4096 31 8 4 0 unreclaimable:page_allocator
kmalloc 345 2048 47 14 2 0 unreclaimable:page_allocator
kmalloc 228 1024 21 12 2 0 unreclaimable:page_allocator
kmalloc 183 512 14 9 3 0 unreclaimable:page_allocator
kmalloc 3892 256 78 31 3 0 unreclaimable:page_allocator
kmalloc 1244 128 18 9 4 0 unreclaimable:page_allocator
kmalloc 1619 64 12 8 1 0 unreclaimable:page_allocator
kmalloc 121 32 8 5 3 0 unreclaimable:page_allocator
kmalloc 1644 16 5 4 0 0 unreclaimable:page_allocator
kmalloc 128 8 4 4 0 0 unreclaimable:page_allocator

Signed-off-by: Christoph Lameter <clameter@xxxxxxx>


Index: linux-2.6.18-rc4-mm3/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.18-rc4-mm3.orig/fs/proc/proc_misc.c 2006-08-26 16:38:02.961172819 -0700
+++ linux-2.6.18-rc4-mm3/fs/proc/proc_misc.c 2006-08-26 16:38:21.425851884 -0700
@@ -394,9 +394,11 @@ static struct file_operations proc_modul
};
#endif

-#ifdef CONFIG_SLAB
+#if defined(CONFIG_SLAB) || defined(CONFIG_MODULAR_SLAB)
extern struct seq_operations slabinfo_op;
+#ifdef CONFIG_SLAB
extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
+#endif
static int slabinfo_open(struct inode *inode, struct file *file)
{
return seq_open(file, &slabinfo_op);
@@ -404,12 +406,14 @@ static int slabinfo_open(struct inode *i
static struct file_operations proc_slabinfo_operations = {
.open = slabinfo_open,
.read = seq_read,
+#ifdef CONFIG_SLAB
.write = slabinfo_write,
+#endif
.llseek = seq_lseek,
.release = seq_release,
};

-#ifdef CONFIG_DEBUG_SLAB_LEAK
+#if defined(CONFIG_DEBUG_SLAB_LEAK) && defined(CONFIG_SLAB)
extern struct seq_operations slabstats_op;
static int slabstats_open(struct inode *inode, struct file *file)
{
@@ -780,9 +784,9 @@ void __init proc_misc_init(void)
create_seq_entry("partitions", 0, &proc_partitions_operations);
create_seq_entry("stat", 0, &proc_stat_operations);
create_seq_entry("interrupts", 0, &proc_interrupts_operations);
-#ifdef CONFIG_SLAB
+#if defined(CONFIG_SLAB) || defined(CONFIG_MODULAR_SLAB)
create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
-#ifdef CONFIG_DEBUG_SLAB_LEAK
+#if defined(CONFIG_DEBUG_SLAB_LEAK) && defined(CONFIG_SLAB)
create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
#endif
#endif
Index: linux-2.6.18-rc4-mm3/mm/Makefile
===================================================================
--- linux-2.6.18-rc4-mm3.orig/mm/Makefile 2006-08-26 16:38:20.822373558 -0700
+++ linux-2.6.18-rc4-mm3/mm/Makefile 2006-08-26 16:38:21.426828386 -0700
@@ -25,4 +25,4 @@ obj-$(CONFIG_MEMORY_HOTPLUG) += memory_h
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_SMP) += allocpercpu.o
-obj-$(CONFIG_MODULAR_SLAB) += allocator.o slabifier.o
+obj-$(CONFIG_MODULAR_SLAB) += allocator.o slabifier.o slabstat.o
Index: linux-2.6.18-rc4-mm3/mm/slabstat.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-rc4-mm3/mm/slabstat.c 2006-08-26 18:24:19.659851704 -0700
@@ -0,0 +1,96 @@
+/*
+ * linux/mm/slabstat.c
+ */
+
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+
+static DECLARE_RWSEM(slabstat_sem);
+
+LIST_HEAD(slab_caches);
+
+void register_slab(struct slab_cache *s)
+{
+ down_write(&slabstat_sem);
+ list_add(&s->list, &slab_caches);
+ up_write(&slabstat_sem);
+}
+
+void unregister_slab(struct slab_cache *s)
+{
+ down_write(&slabstat_sem);
+ list_add(&s->list, &slab_caches);
+ up_write(&slabstat_sem);
+}
+
+static void print_slabinfo_header(struct seq_file *m)
+{
+ /*
+ * Output format version, so at least we can change it
+ * without _too_ many complaints.
+ */
+ seq_puts(m, "slabinfo - version: 3.0\n");
+ seq_puts(m, "# name <objects> <objsize> <num_slabs> "
+ "<partial_slabs> <active_slabs> <order> <allocator>");
+ seq_putc(m, '\n');
+}
+
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+ loff_t n = *pos;
+ struct list_head *p;
+
+ down_read(&slabstat_sem);
+ if (!n)
+ print_slabinfo_header(m);
+ p = slab_caches.next;
+ while (n--) {
+ p = p->next;
+ if (p == &slab_caches)
+ return NULL;
+ }
+ return list_entry(p, struct slab_cache, list);
+}
+
+static void *s_next(struct seq_file *m, void *p, loff_t *pos)
+{
+ struct slab_cache *s = p;
+ ++*pos;
+ return s->list.next == &slab_caches ?
+ NULL : list_entry(s->list.next, struct slab_cache, list);
+}
+
+static void s_stop(struct seq_file *m, void *p)
+{
+ up_read(&slabstat_sem);
+}
+
+static int s_show(struct seq_file *m, void *p)
+{
+ struct slab_cache *s = p;
+ unsigned long total_slabs;
+ unsigned long active_slabs;
+ unsigned long partial_slabs;
+ unsigned long objects;
+
+ objects = s->slab_alloc->get_objects(s, &total_slabs,
+ &active_slabs, &partial_slabs);
+
+ seq_printf(m, "%-21s %7lu %7u %7lu %7lu %7lu %2d %s",
+ s->name, objects, s->size, total_slabs, partial_slabs,
+ active_slabs, s->order, s->page_alloc->name);
+
+ seq_putc(m, '\n');
+ return 0;
+}
+
+/*
+ * slabinfo_op - iterator that generates /proc/slabinfo
+ */
+struct seq_operations slabinfo_op = {
+ .start = s_start,
+ .next = s_next,
+ .stop = s_stop,
+ .show = s_show,
+};
+
Index: linux-2.6.18-rc4-mm3/include/linux/slabstat.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-rc4-mm3/include/linux/slabstat.h 2006-08-26 16:38:21.427804888 -0700
@@ -0,0 +1,9 @@
+#ifndef _LINUX_SLABSTAT_H
+#define _LINUX_SLABSTAT_H
+#include <linux/allocator.h>
+
+void register_slab(struct slab_cache *s);
+void unregister_slab(struct slab_cache *s);
+
+#endif /* _LINUX_SLABSTAT_H */
+

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