The patch titled
Subject: mm/page_owner.c: record tgid
has been added to the -mm tree. Its filename is
mm-page_ownerc-record-tgid.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_ownerc-record-tgid.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_ownerc-record-tgid.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Yixuan Cao <caoyixuan2019@xxxxxxxxxxxxxxxx>
Subject: mm/page_owner.c: record tgid
In a single-threaded process, the pid in kernel task_struct is the same as
the tgid, which can mark the process of page allocation. But in a
multithreaded process, only the task_struct of the thread leader has the
same pid as tgid, and the pids of other threads are different from tgid.
Therefore, tgid is recorded to provide effective information for debugging
and data statistics of multithreaded programs.
This can also be achieved by observing the task name (executable file
name) for a specific process. However, when the same program is started
multiple times, the task name is the same and the tgid is different.
Therefore, in the debugging of multi-threaded programs, combined with the
task name and tgid, more accurate runtime information of a certain run of
the program can be obtained.
Link: https://lkml.kernel.org/r/20220219180450.2399-1-caoyixuan2019@xxxxxxxxxxxxxxxx
Signed-off-by: Yixuan Cao <caoyixuan2019@xxxxxxxxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Rafael Aquini <aquini@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
--- a/mm/page_owner.c~mm-page_ownerc-record-tgid
+++ a/mm/page_owner.c
@@ -31,6 +31,7 @@ struct page_owner {
u64 free_ts_nsec;
char comm[TASK_COMM_LEN];
pid_t pid;
+ pid_t tgid;
};
static bool page_owner_enabled = false;
@@ -165,6 +166,7 @@ static inline void __set_page_owner_hand
page_owner->gfp_mask = gfp_mask;
page_owner->last_migrate_reason = -1;
page_owner->pid = current->pid;
+ page_owner->tgid = current->tgid;
page_owner->ts_nsec = local_clock();
strlcpy(page_owner->comm, current->comm,
sizeof(page_owner->comm));
@@ -233,6 +235,7 @@ void __folio_copy_owner(struct folio *ne
old_page_owner->last_migrate_reason;
new_page_owner->handle = old_page_owner->handle;
new_page_owner->pid = old_page_owner->pid;
+ new_page_owner->tgid = old_page_owner->tgid;
new_page_owner->ts_nsec = old_page_owner->ts_nsec;
new_page_owner->free_ts_nsec = old_page_owner->ts_nsec;
strcpy(new_page_owner->comm, old_page_owner->comm);
@@ -383,11 +386,11 @@ print_page_owner(char __user *buf, size_
return -ENOMEM;
ret = scnprintf(kbuf, count,
- "Page allocated via order %u, mask %#x(%pGg), pid %d (%s), ts %llu ns, free_ts %llu ns\n",
+ "Page allocated via order %u, mask %#x(%pGg), pid %d, tgid %d (%s), ts %llu ns, free_ts %llu ns\n",
page_owner->order, page_owner->gfp_mask,
&page_owner->gfp_mask, page_owner->pid,
- page_owner->comm, page_owner->ts_nsec,
- page_owner->free_ts_nsec);
+ page_owner->tgid, page_owner->comm,
+ page_owner->ts_nsec, page_owner->free_ts_nsec);
/* Print information relevant to grouping pages by mobility */
pageblock_mt = get_pageblock_migratetype(page);
@@ -454,10 +457,10 @@ void __dump_page_owner(const struct page
else
pr_alert("page_owner tracks the page as freed\n");
- pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d (%s), ts %llu, free_ts %llu\n",
+ pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, tgid %d (%s), ts %llu, free_ts %llu\n",
page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask,
- page_owner->pid, page_owner->comm, page_owner->ts_nsec,
- page_owner->free_ts_nsec);
+ page_owner->pid, page_owner->tgid, page_owner->comm,
+ page_owner->ts_nsec, page_owner->free_ts_nsec);
handle = READ_ONCE(page_owner->handle);
if (!handle)
@@ -669,3 +672,4 @@ static int __init pageowner_init(void)
return 0;
}
late_initcall(pageowner_init)
+
_
Patches currently in -mm which might be from caoyixuan2019@xxxxxxxxxxxxxxxx are
tools-vm-page_owner_sortc-delete-invalid-duplicate-code.patch
mm-page_ownerc-record-tgid.patch
