On 05.08.24 16:59, Kirill A. Shutemov wrote:
Unaccepted memory is considered unusable free memory, which is not counted as free on the zone watermark check. This causes get_page_from_freelist() to accept more memory to hit the high watermark, but it creates problems in the reclaim path.
The reclaim path encounters a failed zone watermark check and attempts to reclaim memory. This is usually successful, but if there is little or no reclaimable memory, it can result in endless reclaim with little to no progress. This can occur early in the boot process, just after start of the init process when the only reclaimable memory is the page cache of the init executable and its libraries.
Make unaccepted memory free from watermark check point of view. This way unaccepted memory will never be the trigger of memory reclaim. Accept more memory in the get_page_from_freelist() if needed.
Signed-off-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Reported-by: Jianxiong Gao jxgao@google.com Fixes: dcdfdd40fa82 ("mm: Add support for unaccepted memory") Cc: stable@vger.kernel.org # v6.5+
Nothing jumped at me, sounds reasonable
Acked-by: David Hildenbrand david@redhat.com