C++ (Cpp) stack_depot_fetch Examples

Example #1

File: drm_mm.c Project: avagin/linux

static void show_leaks(struct drm_mm *mm)
{
	struct drm_mm_node *node;
	unsigned long *entries;
	unsigned int nr_entries;
	char *buf;

	buf = kmalloc(BUFSZ, GFP_KERNEL);
	if (!buf)
		return;

	list_for_each_entry(node, drm_mm_nodes(mm), node_list) {
		if (!node->stack) {
			DRM_ERROR("node [%08llx + %08llx]: unknown owner\n",
				  node->start, node->size);
			continue;
		}

		nr_entries = stack_depot_fetch(node->stack, &entries);
		stack_trace_snprint(buf, BUFSZ, entries, nr_entries, 0);
		DRM_ERROR("node [%08llx + %08llx]: inserted at\n%s",
			  node->start, node->size, buf);
	}

	kfree(buf);
}

Example #2

File: i915_vma.c Project: grate-driver/linux

static void vma_print_allocator(struct i915_vma *vma, const char *reason)
{
	unsigned long *entries;
	unsigned int nr_entries;
	char buf[512];

	if (!vma->node.stack) {
		DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
				 vma->node.start, vma->node.size, reason);
		return;
	}

	nr_entries = stack_depot_fetch(vma->node.stack, &entries);
	stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
	DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
			 vma->node.start, vma->node.size, reason, buf);
}

Example #3

File: page_owner.c Project: avagin/linux

void __dump_page_owner(struct page *page)
{
	struct page_ext *page_ext = lookup_page_ext(page);
	struct page_owner *page_owner;
	depot_stack_handle_t handle;
	unsigned long *entries;
	unsigned int nr_entries;
	gfp_t gfp_mask;
	int mt;

	if (unlikely(!page_ext)) {
		pr_alert("There is not page extension available.\n");
		return;
	}

	page_owner = get_page_owner(page_ext);
	gfp_mask = page_owner->gfp_mask;
	mt = gfpflags_to_migratetype(gfp_mask);

	if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) {
		pr_alert("page_owner info is not active (free page?)\n");
		return;
	}

	handle = READ_ONCE(page_owner->handle);
	if (!handle) {
		pr_alert("page_owner info is not active (free page?)\n");
		return;
	}

	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);
	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",
			migrate_reason_names[page_owner->last_migrate_reason]);
}

Example #4

File: page_owner.c Project: avagin/linux

static ssize_t
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, pageblock_mt, page_mt;
	unsigned long *entries;
	unsigned int nr_entries;
	char *kbuf;

	count = min_t(size_t, count, PAGE_SIZE);
	kbuf = kmalloc(count, GFP_KERNEL);
	if (!kbuf)
		return -ENOMEM;

	ret = snprintf(kbuf, count,
			"Page allocated via order %u, mask %#x(%pGg)\n",
			page_owner->order, page_owner->gfp_mask,
			&page_owner->gfp_mask);

	if (ret >= count)
		goto err;

	/* Print information relevant to grouping pages by mobility */
	pageblock_mt = get_pageblock_migratetype(page);
	page_mt  = gfpflags_to_migratetype(page_owner->gfp_mask);
	ret += snprintf(kbuf + ret, count - ret,
			"PFN %lu type %s Block %lu type %s Flags %#lx(%pGp)\n",
			pfn,
			migratetype_names[page_mt],
			pfn >> pageblock_order,
			migratetype_names[pageblock_mt],
			page->flags, &page->flags);

	if (ret >= count)
		goto err;

	nr_entries = stack_depot_fetch(handle, &entries);
	ret += stack_trace_snprint(kbuf + ret, count - ret, entries, nr_entries, 0);
	if (ret >= count)
		goto err;

	if (page_owner->last_migrate_reason != -1) {
		ret += snprintf(kbuf + ret, count - ret,
			"Page has been migrated, last migrate reason: %s\n",
			migrate_reason_names[page_owner->last_migrate_reason]);
		if (ret >= count)
			goto err;
	}

	ret += snprintf(kbuf + ret, count - ret, "\n");
	if (ret >= count)
		goto err;

	if (copy_to_user(buf, kbuf, ret))
		ret = -EFAULT;

	kfree(kbuf);
	return ret;

err:
	kfree(kbuf);
	return -ENOMEM;
}