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65d2d15f41
Currently drain_obj_stock() can potentially call __refill_stock which accesses local cpu stock and thus requires memcg stock's local_lock. However if we look at the code paths leading to drain_obj_stock(), there is never a good reason to refill the memcg stock at all from it. At the moment, drain_obj_stock can be called from reclaim, hotplug cpu teardown, mod_objcg_state() and refill_obj_stock(). For reclaim and hotplug there is no need to refill. For the other two paths, most probably the newly switched objcg would be used in near future and thus no need to refill stock with the older objcg. In addition, __refill_stock() from drain_obj_stock() happens on rare cases, so performance is not really an issue. Let's just uncharge directly instead of refill which will also decouple drain_obj_stock from local cpu stock and local_lock requirements. Link: https://lkml.kernel.org/r/20250404013913.1663035-3-shakeel.butt@linux.dev Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> 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.