On 1/31/22 15:54, Roman Gushchin wrote:
On Mon, Jan 31, 2022 at 02:23:08PM -0500, Waiman Long wrote:
The page_owner information currently includes the pid of the calling
task. That is useful as long as the task is still running. Otherwise,
the number is meaningless. To have more information about the allocating
tasks that had exited by the time the page_owner information is
retrieved, we need to store the command name of the task.
Add a new comm field into page_owner structure to store the command name
and display it when the page_owner information is retrieved. Only the
first 15 characters of the command name will be copied, but that should
be enough in most cases. Even for those commands with longer names,
it shouldn't be hard to guess what they are.
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
mm/page_owner.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/mm/page_owner.c b/mm/page_owner.c
index a471c74c7fe0..8b2b381fd986 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -20,6 +20,7 @@
* to use off stack temporal storage
*/
#define PAGE_OWNER_STACK_DEPTH (16)
+#define PAGE_OWNER_COMM_LEN 16
Not sure I understand why not simply use TASK_COMM_LEN ?
Yes, you are right. I thought TASK_COMM_LEN is larger than 16 without
actually checking it. Will fix that.
Cheers,
Longman
