Jianqun Xu 63bbceab32 mm/page_isolation.c: dump page owner if fail to isolate
CMA alloc may failure due to page busy caused by isolated failure,
it's helpful to dump page owner stack for debug.

To use this debug, there should enable PAGE_OWNER debug first by
- CONFIG_PAGE_OWNER=y
- add “page_owner=on” to boot cmdline

then it will shows as following:
 page allocated via order 0, migratetype Movable, gfp_mask 0x6212ca(GFP_HIGHUSER_MOVABLE|__GFP_NOWARN|__GFP_NORETRY)
  get_page_from_freelist+0x1404/0x1920
  __alloc_pages_nodemask+0xf4/0xe90
  __do_page_cache_readahead+0x104/0x1f0
  filemap_fault+0x3d4/0x618
  ext4_filemap_fault+0x30/0x50
  __do_fault+0x50/0x118
  __handle_mm_fault+0x7e4/0xb40
  handle_mm_fault+0xcc/0x1a0
  do_page_fault+0x1f0/0x4a8
  do_translation_fault+0x5c/0x64
  do_mem_abort+0x54/0xf8
  el0_da+0x1c/0x20

Change-Id: I94b02a7c4ce9174f8151e0979e18adba4011c1d2
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
2020-06-11 15:40:45 +08:00
2020-03-03 07:33:01 +01:00
2020-06-09 22:19:16 +08:00
2020-03-03 07:33:01 +01:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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