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mm: slub: update slab_alloc interface to capture slab stacks

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Update /sys/kernel/debug/slab/alloc_trace interface to capture
slab stack along with slab object details.

Now output of alloc_trace is:
alloc_list: call_site=mempool_alloc_slab+0x1c/0x28 count=2 object_size=1024
slab_size=1472 slab_name=sgpool-32

mempool_alloc_slab+0x1c/0x28

mempool_init_node+0xdc/0x238

mempool_create+0x58/0x88

sg_pool_init+0x70/0xf8

do_one_initcall+0x15c/0x2e8

kernel_init_freeable+0x334/0x3d8

kernel_init+0x18/0x298

ret_from_fork+0x10/0x18.

Change-Id: I19da702bfd22e5526e2c9a04d22717dc70700ae7
Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
This commit is contained in:
Faiyaz Mohammed 2020-10-16 12:30:12 +05:30
commit 891d9b3eb6
1 changed files with 22 additions and 0 deletions
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22
mm/slub.c
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@ -4568,6 +4568,9 @@ struct location {
long max_pid;
DECLARE_BITMAP(cpus, NR_CPUS);
nodemask_t nodes;
#ifdef CONFIG_STACKTRACE
unsigned long addrs[TRACK_ADDRS_COUNT]; /* Called from address */
#endif
};
struct loc_track {
@ -4610,6 +4613,7 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
struct location *l;
unsigned long caddr;
unsigned long age = jiffies - track->when;
unsigned int i = 0;
start = -1;
end = t->count;
@ -4667,6 +4671,15 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
t->count++;
l->count = 1;
l->addr = track->addr;
#ifdef CONFIG_STACKTRACE
for (i = 0; i < TRACK_ADDRS_COUNT; i++)
if (l->addrs[i]) {
l->addrs[i] = track->addrs[i];
continue;
} else
break;
#endif
l->sum_time = age;
l->min_time = age;
l->max_time = age;
@ -6126,10 +6139,19 @@ static int alloc_trace_locations(struct seq_file *seq, struct kmem_cache *s,
for (i = 0; i < t.count; i++) {
struct location *l = &t.loc[i];
unsigned int j = 0;
seq_printf(seq,
"alloc_list: call_site=%pS count=%zu object_size=%zu slab_size=%zu slab_name=%s\n",
l->addr, l->count, s->object_size, s->size, s->name);
#ifdef CONFIG_STACKTRACE
for (j = 0; j < TRACK_ADDRS_COUNT; j++)
if (l->addrs[j]) {
seq_printf(seq, "%pS\n", l->addrs[j]);
continue;
} else
break;
#endif
}
free_loc_track(&t);