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authorSuren Baghdasaryan <surenb@google.com>2024-05-14 09:31:28 -0700
committerAndrew Morton <akpm@linux-foundation.org>2024-05-24 11:55:05 -0700
commita38568a0b46d4a0dbe48f4642cbe2f885c525643 (patch)
treeecd4ec26b30303f4d729ac9371f7178588946e2e /lib
parent8e0545c83d672750632f46e3f9ad95c48c91a0fc (diff)
lib: add version into /proc/allocinfo output
Add version string and a header at the beginning of /proc/allocinfo to allow later format changes. Example output: > head /proc/allocinfo allocinfo - version: 1.0 # <size> <calls> <tag info> 0 0 init/main.c:1314 func:do_initcalls 0 0 init/do_mounts.c:353 func:mount_nodev_root 0 0 init/do_mounts.c:187 func:mount_root_generic 0 0 init/do_mounts.c:158 func:do_mount_root 0 0 init/initramfs.c:493 func:unpack_to_rootfs 0 0 init/initramfs.c:492 func:unpack_to_rootfs 0 0 init/initramfs.c:491 func:unpack_to_rootfs 512 1 arch/x86/events/rapl.c:681 func:init_rapl_pmus 128 1 arch/x86/events/rapl.c:571 func:rapl_cpu_online [akpm@linux-foundation.org: remove stray newline from struct allocinfo_private] Link: https://lkml.kernel.org/r/20240514163128.3662251-1-surenb@google.com Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Kent Overstreet <kent.overstreet@linux.dev> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/alloc_tag.c47
1 files changed, 32 insertions, 15 deletions
diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 531dbe2f5456..11ed973ac359 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -16,47 +16,60 @@ EXPORT_SYMBOL(_shared_alloc_tag);
DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT,
mem_alloc_profiling_key);
+struct allocinfo_private {
+ struct codetag_iterator iter;
+ bool print_header;
+};
+
static void *allocinfo_start(struct seq_file *m, loff_t *pos)
{
- struct codetag_iterator *iter;
+ struct allocinfo_private *priv;
struct codetag *ct;
loff_t node = *pos;
- iter = kzalloc(sizeof(*iter), GFP_KERNEL);
- m->private = iter;
- if (!iter)
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ m->private = priv;
+ if (!priv)
return NULL;
+ priv->print_header = (node == 0);
codetag_lock_module_list(alloc_tag_cttype, true);
- *iter = codetag_get_ct_iter(alloc_tag_cttype);
- while ((ct = codetag_next_ct(iter)) != NULL && node)
+ priv->iter = codetag_get_ct_iter(alloc_tag_cttype);
+ while ((ct = codetag_next_ct(&priv->iter)) != NULL && node)
node--;
- return ct ? iter : NULL;
+ return ct ? priv : NULL;
}
static void *allocinfo_next(struct seq_file *m, void *arg, loff_t *pos)
{
- struct codetag_iterator *iter = (struct codetag_iterator *)arg;
- struct codetag *ct = codetag_next_ct(iter);
+ struct allocinfo_private *priv = (struct allocinfo_private *)arg;
+ struct codetag *ct = codetag_next_ct(&priv->iter);
(*pos)++;
if (!ct)
return NULL;
- return iter;
+ return priv;
}
static void allocinfo_stop(struct seq_file *m, void *arg)
{
- struct codetag_iterator *iter = (struct codetag_iterator *)m->private;
+ struct allocinfo_private *priv = (struct allocinfo_private *)m->private;
- if (iter) {
+ if (priv) {
codetag_lock_module_list(alloc_tag_cttype, false);
- kfree(iter);
+ kfree(priv);
}
}
+static void print_allocinfo_header(struct seq_buf *buf)
+{
+ /* Output format version, so we can change it. */
+ seq_buf_printf(buf, "allocinfo - version: 1.0\n");
+ seq_buf_printf(buf, "# <size> <calls> <tag info>\n");
+}
+
static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct)
{
struct alloc_tag *tag = ct_to_alloc_tag(ct);
@@ -71,13 +84,17 @@ static void alloc_tag_to_text(struct seq_buf *out, struct codetag *ct)
static int allocinfo_show(struct seq_file *m, void *arg)
{
- struct codetag_iterator *iter = (struct codetag_iterator *)arg;
+ struct allocinfo_private *priv = (struct allocinfo_private *)arg;
char *bufp;
size_t n = seq_get_buf(m, &bufp);
struct seq_buf buf;
seq_buf_init(&buf, bufp, n);
- alloc_tag_to_text(&buf, iter->ct);
+ if (priv->print_header) {
+ print_allocinfo_header(&buf);
+ priv->print_header = false;
+ }
+ alloc_tag_to_text(&buf, priv->iter.ct);
seq_commit(m, seq_buf_used(&buf));
return 0;
}