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mm/page_owner: Simplify stack trace handling 

Replace the indirection through struct stack_trace by using the storage
array based interfaces.

The original code in all printing functions is really wrong. It allocates a
storage array on stack which is unused because depot_fetch_stack() does not
store anything in it. It overwrites the entries pointer in the stack_trace
struct so it points to the depot storage.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: linux-mm@kvack.org
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: kasan-dev@googlegroups.com
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: iommu@lists.linux-foundation.org
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: David Sterba <dsterba@suse.com>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: linux-btrfs@vger.kernel.org
Cc: dm-devel@redhat.com
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: linux-arch@vger.kernel.org
Link: https://lkml.kernel.org/r/20190425094802.067210525@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-04-25 11:45:03 +02:00
parent 880e049c9c
commit af52bf6b92
1 changed files with 28 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
mm/page_owner.c
View File

@ -58,15 +58,10 @@ static bool need_page_owner(void)
static __always_inline depot_stack_handle_t create_dummy_stack(void)
{
unsigned long entries[4];
struct stack_trace dummy;
unsigned int nr_entries;
dummy.nr_entries = 0;
dummy.max_entries = ARRAY_SIZE(entries);
dummy.entries = &entries[0];
dummy.skip = 0;
save_stack_trace(&dummy);
return depot_save_stack(&dummy, GFP_KERNEL);
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
return stack_depot_save(entries, nr_entries, GFP_KERNEL);
}
static noinline void register_dummy_stack(void)
@ -120,46 +115,39 @@ void __reset_page_owner(struct page *page, unsigned int order)
}
}
static inline bool check_recursive_alloc(struct stack_trace *trace,
unsigned long ip)
static inline bool check_recursive_alloc(unsigned long *entries,
unsigned int nr_entries,
unsigned long ip)
{
int i;
unsigned int i;
if (!trace->nr_entries)
return false;
for (i = 0; i < trace->nr_entries; i++) {
if (trace->entries[i] == ip)
for (i = 0; i < nr_entries; i++) {
if (entries[i] == ip)
return true;
}
return false;
}
static noinline depot_stack_handle_t save_stack(gfp_t flags)
{
unsigned long entries[PAGE_OWNER_STACK_DEPTH];
struct stack_trace trace = {
.nr_entries = 0,
.entries = entries,
.max_entries = PAGE_OWNER_STACK_DEPTH,
.skip = 2
};
depot_stack_handle_t handle;
unsigned int nr_entries;
save_stack_trace(&trace);
nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 2);
/*
* We need to check recursion here because our request to stackdepot
* could trigger memory allocation to save new entry. New memory
* allocation would reach here and call depot_save_stack() again
* if we don't catch it. There is still not enough memory in stackdepot
* so it would try to allocate memory again and loop forever.
* We need to check recursion here because our request to
* stackdepot could trigger memory allocation to save new
* entry. New memory allocation would reach here and call
* stack_depot_save_entries() again if we don't catch it. There is
* still not enough memory in stackdepot so it would try to
* allocate memory again and loop forever.
*/
if (check_recursive_alloc(&trace, _RET_IP_))
if (check_recursive_alloc(entries, nr_entries, _RET_IP_))
return dummy_handle;
handle = depot_save_stack(&trace, flags);
handle = stack_depot_save(entries, nr_entries, flags);
if (!handle)
handle = failure_handle;
@ -337,16 +325,10 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
struct page *page, struct page_owner *page_owner,
depot_stack_handle_t handle)
{
int ret;
int pageblock_mt, page_mt;
int ret, pageblock_mt, page_mt;
unsigned long *entries;
unsigned int nr_entries;
char *kbuf;
unsigned long entries[PAGE_OWNER_STACK_DEPTH];
struct stack_trace trace = {
.nr_entries = 0,
.entries = entries,
.max_entries = PAGE_OWNER_STACK_DEPTH,
.skip = 0
};
count = min_t(size_t, count, PAGE_SIZE);
kbuf = kmalloc(count, GFP_KERNEL);
@ -375,8 +357,8 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
if (ret >= count)
goto err;
depot_fetch_stack(handle, &trace);
ret += snprint_stack_trace(kbuf + ret, count - ret, &trace, 0);
nr_entries = stack_depot_fetch(handle, &entries);
ret += stack_trace_snprint(kbuf + ret, count - ret, entries, nr_entries, 0);
if (ret >= count)
goto err;
@ -407,14 +389,9 @@ void __dump_page_owner(struct page *page)
{
struct page_ext *page_ext = lookup_page_ext(page);
struct page_owner *page_owner;
unsigned long entries[PAGE_OWNER_STACK_DEPTH];
struct stack_trace trace = {
.nr_entries = 0,
.entries = entries,
.max_entries = PAGE_OWNER_STACK_DEPTH,
.skip = 0
};
depot_stack_handle_t handle;
unsigned long *entries;
unsigned int nr_entries;
gfp_t gfp_mask;
int mt;
@ -438,10 +415,10 @@ void __dump_page_owner(struct page *page)
return;
}
depot_fetch_stack(handle, &trace);
nr_entries = stack_depot_fetch(handle, &entries);
pr_alert("page allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",
page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
print_stack_trace(&trace, 0);
stack_trace_print(entries, nr_entries, 0);
if (page_owner->last_migrate_reason != -1)
pr_alert("page has been migrated, last migrate reason: %s\n",