| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20201210160357.27779-1-georgi.djakov@linaro.org>
Date: Thu, 10 Dec 2020 18:03:57 +0200
From: Georgi Djakov <georgi.djakov@...aro.org>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, vbabka@...e.cz, corbet@....net,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
lmark@...eaurora.org, georgi.djakov@...aro.org
Subject: [PATCH v3] mm/page_owner: Record timestamp and pid
From: Liam Mark <lmark@...eaurora.org>
Collect the time for each allocation recorded in page owner so that
allocation "surges" can be measured.
Record the pid for each allocation recorded in page owner so that the
source of allocation "surges" can be better identified.
The above is very useful when doing memory analysis. On a crash for
example, we can get this information from kdump (or ramdump) and parse it
to figure out memory allocation problems.
Please note that on x86_64 this increases the size of struct page_owner
from 16 bytes to 32.
Vlastimil: it's not a functionality intended for production, so unless
somebody says they need to enable page_owner for debugging and this
increase prevents them from fitting into available memory, let's not
complicate things with making this optional.
Signed-off-by: Liam Mark <lmark@...eaurora.org>
Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Jonathan Corbet <corbet@....net>
---
v3:
- Fix the warnings in the documentation (reported in linux-next) and make
Sphinx happy:
Documentation/vm/page_owner.rst:44: WARNING: Literal block ends without a blank line; unexpected unindent.
Documentation/vm/page_owner.rst:49: WARNING: Literal block ends without a blank line; unexpected unindent.
v2: https://lore.kernel.org/r/20201209125153.10533-1-georgi.djakov@linaro.org
- Improve the commit message (Andrew and Vlastimil)
- Update page_owner.rst with more recent object size information (Andrew)
- Use pid_t for the pid (Andrew)
- Print the info also in __dump_page_owner() (Vlastimil)
v1: https://lore.kernel.org/r/20201112184106.733-1-georgi.djakov@linaro.org
Documentation/vm/page_owner.rst | 12 ++++++------
mm/page_owner.c | 17 +++++++++++++----
2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/Documentation/vm/page_owner.rst b/Documentation/vm/page_owner.rst
index 02deac76673f..4e67c2e9bbed 100644
--- a/Documentation/vm/page_owner.rst
+++ b/Documentation/vm/page_owner.rst
@@ -41,17 +41,17 @@ size change due to this facility.
- Without page owner::
text data bss dec hex filename
- 40662 1493 644 42799 a72f mm/page_alloc.o
+ 48392 2333 644 51369 c8a9 mm/page_alloc.o
- With page owner::
text data bss dec hex filename
- 40892 1493 644 43029 a815 mm/page_alloc.o
- 1427 24 8 1459 5b3 mm/page_ext.o
- 2722 50 0 2772 ad4 mm/page_owner.o
+ 48800 2445 644 51889 cab1 mm/page_alloc.o
+ 6574 108 29 6711 1a37 mm/page_owner.o
+ 1025 8 8 1041 411 mm/page_ext.o
-Although, roughly, 4 KB code is added in total, page_alloc.o increase by
-230 bytes and only half of it is in hotpath. Building the kernel with
+Although, roughly, 8 KB code is added in total, page_alloc.o increase by
+520 bytes and less than half of it is in hotpath. Building the kernel with
page owner and turning it on if needed would be great option to debug
kernel memory problem.
diff --git a/mm/page_owner.c b/mm/page_owner.c
index b735a8eafcdb..af464bb7fbe7 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -10,6 +10,7 @@
#include <linux/migrate.h>
#include <linux/stackdepot.h>
#include <linux/seq_file.h>
+#include <linux/sched/clock.h>
#include "internal.h"
@@ -25,6 +26,8 @@ struct page_owner {
gfp_t gfp_mask;
depot_stack_handle_t handle;
depot_stack_handle_t free_handle;
+ u64 ts_nsec;
+ pid_t pid;
};
static bool page_owner_enabled = false;
@@ -172,6 +175,8 @@ static inline void __set_page_owner_handle(struct page *page,
page_owner->order = order;
page_owner->gfp_mask = gfp_mask;
page_owner->last_migrate_reason = -1;
+ page_owner->pid = current->pid;
+ page_owner->ts_nsec = local_clock();
__set_bit(PAGE_EXT_OWNER, &page_ext->flags);
__set_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags);
@@ -236,6 +241,8 @@ void __copy_page_owner(struct page *oldpage, struct page *newpage)
new_page_owner->last_migrate_reason =
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->ts_nsec = old_page_owner->ts_nsec;
/*
* We don't clear the bit on the oldpage as it's going to be freed
@@ -349,9 +356,10 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
return -ENOMEM;
ret = snprintf(kbuf, count,
- "Page allocated via order %u, mask %#x(%pGg)\n",
+ "Page allocated via order %u, mask %#x(%pGg), pid %d, ts %llu ns\n",
page_owner->order, page_owner->gfp_mask,
- &page_owner->gfp_mask);
+ &page_owner->gfp_mask, page_owner->pid,
+ page_owner->ts_nsec);
if (ret >= count)
goto err;
@@ -427,8 +435,9 @@ void __dump_page_owner(struct page *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)\n",
- page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
+ pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, ts %llu\n",
+ page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask,
+ page_owner->pid, page_owner->ts_nsec);
handle = READ_ONCE(page_owner->handle);
if (!handle) {
Powered by blists - more mailing lists