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Subject[RFC 1/3] mm/slub: aggregate objects in cache by stack trace
Date
From: Oliver Glitta <glittao@gmail.com>

Aggregate objects in slub cache by stack trace in addition to caller
address during alloc_calls and free_calls implementation
in debugfs. Add stack trace to output.

Add all_objects implementation to debugfs to print information
about all objects.

Signed-off-by: Oliver Glitta <glittao@gmail.com>
---
Based on next-20210518 and
https://lore.kernel.org/r/1621341949-26762-1-git-send-email-faiyazm@codeaurora.org/

mm/slub.c | 30 ++++++++++++++++++++++++++++--
1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index e9b84eddc50d..d5ed6ed7d68b 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4770,6 +4770,7 @@ EXPORT_SYMBOL(validate_slab_cache);
*/

struct location {
+ depot_stack_handle_t handle;
unsigned long count;
unsigned long addr;
long long sum_time;
@@ -4822,9 +4823,15 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
{
long start, end, pos;
struct location *l;
- unsigned long caddr;
+ unsigned long caddr, chandle;
unsigned long age = jiffies - track->when;
+ depot_stack_handle_t handle;

+#ifdef CONFIG_STACKDEPOT
+ handle = READ_ONCE(track->handle);
+#else
+ handle = 0;
+#endif
start = -1;
end = t->count;

@@ -4839,7 +4846,8 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
break;

caddr = t->loc[pos].addr;
- if (track->addr == caddr) {
+ chandle = t->loc[pos].handle;
+ if ((track->addr == caddr) && (handle == chandle)) {

l = &t->loc[pos];
l->count++;
@@ -4864,6 +4872,8 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,

if (track->addr < caddr)
end = pos;
+ else if (track->addr == caddr && handle < chandle)
+ end = pos;
else
start = pos;
}
@@ -4886,6 +4896,7 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
l->max_time = age;
l->min_pid = track->pid;
l->max_pid = track->pid;
+ l->handle = handle;
cpumask_clear(to_cpumask(l->cpus));
cpumask_set_cpu(track->cpu, to_cpumask(l->cpus));
nodes_clear(l->nodes);
@@ -5837,6 +5848,21 @@ static int slab_debugfs_show(struct seq_file *seq, void *v)
seq_printf(seq, " nodes=%*pbl",
nodemask_pr_args(&l->nodes));

+#ifdef CONFIG_STACKDEPOT
+ {
+ depot_stack_handle_t handle;
+ unsigned long *entries;
+ unsigned int nr_entries, j;
+
+ handle = READ_ONCE(l->handle);
+ if (handle) {
+ nr_entries = stack_depot_fetch(handle, &entries);
+ seq_puts(seq, "\n");
+ for (j = 0; j < nr_entries; j++)
+ seq_printf(seq, "\t%pS\n", (void *)entries[j]);
+ }
+ }
+#endif
seq_puts(seq, "\n");
}

--
2.31.1.272.g89b43f80a5
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