From: Andi Kleen <ak@linux.intel.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andi Kleen <andi@firstfloor.org>,
akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: Simplify and batch working set shadow pages LRU isolation locking
Date: Fri, 27 Oct 2017 10:22:05 -0700 [thread overview]
Message-ID: <20171027172205.GA22894@tassilo.jf.intel.com> (raw)
In-Reply-To: <20171027170156.GA1743@cmpxchg.org>
> The nlru->lock in list_lru_shrink_walk() is the only thing that keeps
> truncation blocked on workingset_update_node() -> list_lru_del() and
> so ultimately keeping it from freeing the radix tree node.
>
> It's not safe to access the nodes on the private list after that.
True.
>
> Batching mapping->tree_lock is possible, but you have to keep the
> lock-handoff scheme. Pass a &mapping to list_lru_shrink_walk() and
> only unlock and spin_trylock(&mapping->tree_lock) if it changes?
Yes something like that could work. Thanks.
-Andi
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next prev parent reply other threads:[~2017-10-27 17:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-26 23:48 [PATCH] mm: Simplify and batch working set shadow pages LRU isolation locking Andi Kleen
2017-10-27 17:01 ` Johannes Weiner
2017-10-27 17:22 ` Andi Kleen [this message]
2017-10-27 20:59 ` Daniel Jordan
2017-10-27 20:51 ` Daniel Jordan
2017-11-08 1:56 ` [lkp-robot] [mm] 47bd678bc7: WARNING:at_mm/workingset.c:#scan_shadow_nodes kernel test robot
2017-11-09 0:03 ` Andi Kleen
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