rcu/tree: cache specified number of objects

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In order to reduce the dynamic need for pages in kfree_rcu(),
pre-allocate a configurable number of pages per CPU and link
them in a list. When kfree_rcu() reclaims objects, the object's
container page is cached into a list instead of being released
to the low-level page allocator.

Such an approach provides O(1) access to free pages while also
reducing the number of requests to the page allocator. It also
makes the kfree_rcu() code to have free pages available during
a low memory condition.

A read-only sysfs parameter (rcu_min_cached_objs) reflects the
minimum number of allowed cached pages per CPU.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Uladzislau Rezki (Sony) 2020-05-25 23:47:52 +02:00 • committed by Paul E. McKenney

parent 69f08d3999

commit 53c72b590b

2 changed files with 70 additions and 4 deletions

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8

Documentation/admin-guide/kernel-parameters.txt

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66

kernel/rcu/tree.c

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