kevin/linux
1
Fork 0
Code

lib: add memory allocations report in show_mem()

Browse Source 
Include allocations in show_mem reports.

Link: https://lkml.kernel.org/r/20240321163705.3067592-33-surenb@google.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Kees Cook <keescook@chromium.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andreas Hindborg <a.hindborg@samsung.com>
Cc: Benno Lossin <benno.lossin@proton.me>
Cc: "Björn Roy Baron" <bjorn3_gh@protonmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Gary Guo <gary@garyguo.net>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-03-21 09:36:54 -07:00 committed by Andrew Morton
parent 9e54dd8b64
commit 1438d349d1
5 changed files with 77 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/alloc_tag.h
View File

@ -31,6 +31,13 @@ struct alloc_tag {
#ifdef CONFIG_MEM_ALLOC_PROFILING
struct codetag_bytes {
struct codetag *ct;
s64 bytes;
};
size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sleep);
static inline struct alloc_tag *ct_to_alloc_tag(struct codetag *ct)
{
return container_of(ct, struct alloc_tag, ct);

1
include/linux/codetag.h
View File

@ -61,6 +61,7 @@ struct codetag_iterator {
}
void codetag_lock_module_list(struct codetag_type *cttype, bool lock);
bool codetag_trylock_module_list(struct codetag_type *cttype);
struct codetag_iterator codetag_get_ct_iter(struct codetag_type *cttype);
struct codetag *codetag_next_ct(struct codetag_iterator *iter);

38
lib/alloc_tag.c
View File

@ -89,6 +89,44 @@ static const struct seq_operations allocinfo_seq_op = {
.show = allocinfo_show,
};
size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sleep)
{
struct codetag_iterator iter;
struct codetag *ct;
struct codetag_bytes n;
unsigned int i, nr = 0;
if (can_sleep)
codetag_lock_module_list(alloc_tag_cttype, true);
else if (!codetag_trylock_module_list(alloc_tag_cttype))
return 0;
iter = codetag_get_ct_iter(alloc_tag_cttype);
while ((ct = codetag_next_ct(&iter))) {
struct alloc_tag_counters counter = alloc_tag_read(ct_to_alloc_tag(ct));
n.ct = ct;
n.bytes = counter.bytes;
for (i = 0; i < nr; i++)
if (n.bytes > tags[i].bytes)
break;
if (i < count) {
nr -= nr == count;
memmove(&tags[i + 1],
&tags[i],
sizeof(tags[0]) * (nr - i));
nr++;
tags[i] = n;
}
}
codetag_lock_module_list(alloc_tag_cttype, false);
return nr;
}
static void __init procfs_init(void)
{
proc_create_seq("allocinfo", 0444, NULL, &allocinfo_seq_op);

5
lib/codetag.c
View File

@ -36,6 +36,11 @@ void codetag_lock_module_list(struct codetag_type *cttype, bool lock)
up_read(&cttype->mod_lock);
}
bool codetag_trylock_module_list(struct codetag_type *cttype)
{
return down_read_trylock(&cttype->mod_lock) != 0;
}
struct codetag_iterator codetag_get_ct_iter(struct codetag_type *cttype)
{
struct codetag_iterator iter = {

26
mm/show_mem.c
View File

@ -423,4 +423,30 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
#ifdef CONFIG_MEMORY_FAILURE
printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
#endif
#ifdef CONFIG_MEM_ALLOC_PROFILING
{
struct codetag_bytes tags[10];
size_t i, nr;
nr = alloc_tag_top_users(tags, ARRAY_SIZE(tags), false);
if (nr) {
pr_notice("Memory allocations:\n");
for (i = 0; i < nr; i++) {
struct codetag *ct = tags[i].ct;
struct alloc_tag *tag = ct_to_alloc_tag(ct);
struct alloc_tag_counters counter = alloc_tag_read(tag);
/* Same as alloc_tag_to_text() but w/o intermediate buffer */
if (ct->modname)
pr_notice("%12lli %8llu %s:%u [%s] func:%s\n",
counter.bytes, counter.calls, ct->filename,
ct->lineno, ct->modname, ct->function);
else
pr_notice("%12lli %8llu %s:%u func:%s\n",
counter.bytes, counter.calls, ct->filename,
ct->lineno, ct->function);
}
}
}
#endif
}