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2ede3c13be
rmqueue_bulk() batches the allocation of multiple elements to refill the per-CPU buffers into a single hold of the zone lock. Each element is allocated and checked using check_pcp_refill(). The check touches every related struct page which is especially expensive for higher order allocations (huge pages). This patch reduces the time holding the lock by moving the check out of the critical section similar to rmqueue_buddy() which allocates a single element. Measurements of parallel allocation-heavy workloads show a reduction of the average huge page allocation latency of 50 percent for two cores and nearly 90 percent for 24 cores. Link: https://lkml.kernel.org/r/20230201162549.68384-1-halbuer@sra.uni-hannover.de Signed-off-by: Alexander Halbuer <halbuer@sra.uni-hannover.de> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> 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 Restructured Text 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.