rcu/kvfree: Make drain_page_cache() take early return if cache is disabled

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If the rcutree.rcu_min_cached_objs kernel boot parameter is set to zero,
then krcp->page_cache_work will never be triggered to fill page cache.
In addition, the put_cached_bnode() will not fill page cache.  As a
result krcp->bkvcache will always be empty, so there is no need to acquire
krcp->lock to get page from krcp->bkvcache.  This commit therefore makes
drain_page_cache() return immediately if the rcu_min_cached_objs is zero.

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Zqiang 2023-04-18 20:27:02 +08:00 • committed by Paul E. McKenney

parent 60888b77a0

commit 6b706e5603

1 changed files with 3 additions and 0 deletions

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kernel/rcu/tree.c

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