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Patch series "reparent the THP split queue", v6. In the future, we will reparent LRU folios during memcg offline to eliminate dying memory cgroups, which requires reparenting the THP split queue to its parent memcg. Similar to list_lru, the split queue is relatively independent and does not need to be reparented along with objcg and LRU folios (holding objcg lock and lru lock). Therefore, we can apply the same mechanism as list_lru to reparent the split queue first when memcg is offine. The first three patches in this series are separated from the series "Eliminate Dying Memory Cgroup" [1], mainly to do some cleanup and preparatory work. The last patch reparents the THP split queue to its parent memcg during memcg offline. This patch (of 4): folio_memcg_charged() is intended for use when the user is unconcerned about the returned memcg pointer. It is more efficient than folio_memcg(). Therefore, replace folio_memcg() with folio_memcg_charged(). Link: https://lkml.kernel.org/r/56624d537520e33e5a6b3755238b3dfb959a52ee.1762762324.git.zhengqi.arch@bytedance.com Link: https://lore.kernel.org/all/20250415024532.26632-1-songmuchun@bytedance.com/ [1] Signed-off-by: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev> Reviewed-by: Harry Yoo <harry.yoo@oracle.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Barry Song <baohua@kernel.org> Cc: Dev Jain <dev.jain@arm.com> Cc: Hugh Dickins <hughd@google.com> Cc: Lance Yang <lance.yang@linux.dev> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Nico Pache <npache@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Muchun Song <muchun.song@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 reStructuredText markup notation.
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.