Re: [patch 00/12] Slab defragmentation V3

From: Michal Piotrowski
Date: Fri Jun 08 2007 - 15:32:59 EST

Christoph Lameter pisze:
On Fri, 8 Jun 2007, Michal Piotrowski wrote:

Yes, it does. Thanks!

Ahhh... That leds to the discovery more sysfs problems. I need to make sure not to be holding locks while calling into sysfs. More cleanup...



sysfs... I forgot about my sysfs test case

#! /bin/sh

for i in `find /sys/ -type f`
do
echo "wyÅwietlam $i"
sudo cat $i > /dev/null
# sleep 1s
done

[ 2816.175573] BUG: sleeping function called from invalid context at mm/page_alloc.c:1547
[ 2816.183578] in_atomic():1, irqs_disabled():1
[ 2816.187946] 1 lock held by cat/12586:
[ 2816.191705] #0: (&n->list_lock){++..}, at: [<c0481630>] list_locations+0x3d/0x26b

l *list_locations+0x3d
0xc1081630 is in list_locations (mm/slub.c:3388).
3383 struct page *page;
3384
3385 if (!atomic_read(&n->nr_slabs))
3386 continue;
3387
3388 spin_lock_irqsave(&n->list_lock, flags);
3389 list_for_each_entry(page, &n->partial, lru)
3390 process_slab(&t, s, page, alloc);
3391 list_for_each_entry(page, &n->full, lru)
3392 process_slab(&t, s, page, alloc);


[ 2816.199571] irq event stamp: 11526
[ 2816.203054] hardirqs last enabled at (11525): [<c042adbd>] on_each_cpu+0x3b/0x71
[ 2816.210689] hardirqs last disabled at (11526): [<c065d241>] _spin_lock_irqsave+0x13/0x6e
[ 2816.218910] softirqs last enabled at (11236): [<c042b5dd>] __do_softirq+0xdf/0xe5
[ 2816.226635] softirqs last disabled at (11229): [<c0406d65>] do_softirq+0x68/0x11f

l *on_each_cpu+0x3b
0xc102adbd is in on_each_cpu (include/asm/irqflags.h:36).
31 asm volatile("cli": : :"memory");
32 }
33
34 static inline void native_irq_enable(void)
35 {
36 asm volatile("sti": : :"memory");
37 }
38
39 static inline void native_safe_halt(void)
40 {

l *_spin_lock_irqsave+0x13
0xc125d241 is in _spin_lock_irqsave (kernel/spinlock.c:84).
79 unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
80 {
81 unsigned long flags;
82
83 local_irq_save(flags);
84 preempt_disable();
85 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
86 /*
87 * On lockdep we dont want the hand-coded irq-enable of
88 * _raw_spin_lock_flags() code, because lockdep assumes

l *__do_softirq+0xdf
0xc102b5dd is in __do_softirq (kernel/softirq.c:252).
247
248 trace_softirq_exit();
249
250 account_system_vtime(current);
251 _local_bh_enable();
252 }
253
254 #ifndef __ARCH_HAS_DO_SOFTIRQ
255
256 asmlinkage void do_softirq(void)

l *do_softirq+0x68
0xc1006d65 is in do_softirq (arch/i386/kernel/irq.c:222).
217 irqctx->tinfo.previous_esp = current_stack_pointer;
218
219 /* build the stack frame on the softirq stack */
220 isp = (u32*) ((char*)irqctx + sizeof(*irqctx));
221
222 asm volatile(
223 " xchgl %%ebx,%%esp \n"
224 " call __do_softirq \n"
225 " movl %%ebx,%%esp \n"
226 : "=b"(isp)


[ 2816.234235] [<c04052ad>] dump_trace+0x63/0x1eb
[ 2816.238888] [<c040544f>] show_trace_log_lvl+0x1a/0x2f
[ 2816.244211] [<c040608d>] show_trace+0x12/0x14
[ 2816.248757] [<c04060a5>] dump_stack+0x16/0x18
[ 2816.253288] [<c041eef1>] __might_sleep+0xce/0xd5
[ 2816.258046] [<c04680b5>] __alloc_pages+0x33/0x324
[ 2816.262968] [<c04683fb>] __get_free_pages+0x55/0x66
[ 2816.268060] [<c0481517>] process_slab+0x1bd/0x299
[ 2816.272988] [<c048164a>] list_locations+0x57/0x26b
[ 2816.277981] [<c0481880>] free_calls_show+0x22/0x29
[ 2816.282965] [<c047e702>] slab_attr_show+0x1c/0x20
[ 2816.287891] [<c04c1bd9>] sysfs_read_file+0x94/0x105
[ 2816.293018] [<c048580b>] vfs_read+0xcf/0x158
[ 2816.297539] [<c0485c71>] sys_read+0x3d/0x72
[ 2816.301910] [<c040420c>] syscall_call+0x7/0xb
[ 2816.306486] [<b7f30410>] 0xb7f30410
[ 2816.310165] =======================
[ 2818.826341] BUG: sleeping function called from invalid context at mm/page_alloc.c:1547
[ 2818.834388] in_atomic():1, irqs_disabled():1
[ 2818.838751] 1 lock held by cat/12635:
[ 2818.842506] #0: (&n->list_lock){++..}, at: [<c0481630>] list_locations+0x3d/0x26b
[ 2818.850460] irq event stamp: 11494
[ 2818.853908] hardirqs last enabled at (11493): [<c042adbd>] on_each_cpu+0x3b/0x71
[ 2818.861505] hardirqs last disabled at (11494): [<c065d241>] _spin_lock_irqsave+0x13/0x6e
[ 2818.869831] softirqs last enabled at (11258): [<c042b5dd>] __do_softirq+0xdf/0xe5
[ 2818.877576] softirqs last disabled at (11215): [<c0406d65>] do_softirq+0x68/0x11f
[ 2818.885217] [<c04052ad>] dump_trace+0x63/0x1eb
[ 2818.889893] [<c040544f>] show_trace_log_lvl+0x1a/0x2f
[ 2818.895112] [<c040608d>] show_trace+0x12/0x14
[ 2818.899667] [<c04060a5>] dump_stack+0x16/0x18
[ 2818.904232] [<c041eef1>] __might_sleep+0xce/0xd5
[ 2818.909046] [<c04680b5>] __alloc_pages+0x33/0x324
[ 2818.913956] [<c04683fb>] __get_free_pages+0x55/0x66
[ 2818.919022] [<c0481517>] process_slab+0x1bd/0x299
[ 2818.923923] [<c048164a>] list_locations+0x57/0x26b
[ 2818.928961] [<c0481880>] free_calls_show+0x22/0x29
[ 2818.933916] [<c047e702>] slab_attr_show+0x1c/0x20
[ 2818.938825] [<c04c1bd9>] sysfs_read_file+0x94/0x105
[ 2818.943900] [<c048580b>] vfs_read+0xcf/0x158
[ 2818.948335] [<c0485c71>] sys_read+0x3d/0x72
[ 2818.952683] [<c040420c>] syscall_call+0x7/0xb
[ 2818.957213] [<b7f82410>] 0xb7f82410
[ 2818.960896] =======================

http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc4-mm2-sd3/sd-dmesg2

Regards,
Michal

--
"Najbardziej brakowaÅo mi twojego milczenia."
-- Andrzej Sapkowski "CoÅ wiÄcej"
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