Page_owner使用简介

2024-01-26 12:28

文章标签 使用 page 简介 owner

本文主要是介绍Page_owner使用简介，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

背景

Page_owner介绍

Page_owner支持

cmdline开启Page_owner

解析工具

复现问题

小结

背景

在项目中有一部分camera相关的包括camera driver使用大于等于order3的内存分配点，并没有统计到camera provider进程上。所以想通过page_owner，调查一下相机没有统计到的内存申请。

Page_owner介绍

page owner is for the tracking about who allocated each page. It can be used to debug memory leak or to find a memory hogger.

官方介绍如下：

page owner: Tracking about who allocated each page — The Linux Kernel documentation

Page_owner支持

CONFIG_PAGE_OWNER=y

cmdline开启Page_owner

在BoardConfig.mk文件中，加上对应makefile的修改。

解析工具

page_owner.sh

#!/bin/bashadb shell 'cat /sys/kernel/debug/page_owner > /data/local/tmp/page_owner_full.txt'adb pull /data/local/tmp/page_owner_full.txtgrep -v ^PFN page_owner_full.txt > page_owner.txt./page_owner_sort page_owner.txt sorted_page_owner.txt

复现问题

复现问题后执行：./page_owner.sh

最终生成：sorted_page_owner.txt

如下类似内容：
1 times:           
Page allocated via order 9, mask 0x1521c2(__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO|__GFP_HARDWALL), pid 2379, tgid 1603 (Preview_2), ts 128125282786 ns, free_ts 75571306063 nspost_alloc_hook+0x1c0/0x208prep_new_page+0x28/0x12cget_page_from_freelist+0x1190/0x12b4__alloc_pages+0x12c/0x2fcqcom_extend_sys_heap_alloc_largest_available+0x2cc/0xa98 [qcom_dma_heaps]system_qcom_sg_buffer_alloc+0xf4/0x380 [qcom_dma_heaps]system_heap_allocate+0x90/0x168 [qcom_dma_heaps]dma_heap_buffer_alloc+0x5c/0x6ccam_mem_util_get_dma_buf+0x2c4/0x718 [camera]                                                                                                                                                                                                              cam_mem_mgr_alloc_and_map+0x284/0x7f8 [camera] cam_private_ioctl+0x318/0x274c [camera] __video_do_ioctl+0x298/0x4dcvideo_usercopy+0x43c/0xb38video_ioctl2+0x18/0x28v4l2_ioctl+0x6c/0x84__arm64_sys_ioctl+0xa8/0xe41 times:
Page allocated via order 0, mask 0x100dc0(GFP_USER|__GFP_ZERO), pid 14313, tgid 1603 (SyncThread), ts 128067784036 ns, free_ts 127389201898 nspost_alloc_hook+0x1c0/0x208prep_new_page+0x28/0x12cget_page_from_freelist+0x1190/0x12b4__alloc_pages+0x12c/0x2fcqcom_io_pgtable_alloc_page+0xa0/0x1e8 [qcom_iommu_util]__arm_lpae_alloc_pages+0x34/0x178 [qcom_iommu_util]__arm_lpae_map+0x258/0x4fc [qcom_iommu_util]__arm_lpae_map+0x4c4/0x4fc [qcom_iommu_util]qcom_arm_lpae_map_pages+0xf4/0x168 [qcom_iommu_util]arm_smmu_map_pages+0xd0/0x26c [arm_smmu]__iommu_map+0x1d0/0x330__iommu_map_sg+0xcc/0x1d4iommu_map_sg+0x14/0x20cam_smmu_map_buffer_validate+0x744/0x9c8 [camera] cam_smmu_map_user_iova+0x31c/0x5b8 [camera] cam_mem_util_map_hw_va+0x1c8/0x3b4 [camera]