From: Peter Zijlstra <peterz@infradead.org>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: akpm@linux-foundation.org, fweisbec@gmail.com,
tglx@linutronix.de, hch@infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] smp, ipi: Speed up IPI handling by invoking the callbacks in reverse order
Date: Wed, 4 Jun 2014 21:47:31 +0200 [thread overview]
Message-ID: <20140604194731.GO13930@laptop.programming.kicks-ass.net> (raw)
In-Reply-To: <20140604193934.21321.19185.stgit@srivatsabhat.in.ibm.com>
On Thu, Jun 05, 2014 at 01:09:35AM +0530, Srivatsa S. Bhat wrote:
> The current implementation of lockless list (llist) has a drawback: if we
> want to traverse the list in FIFO order (oldest to newest), we need to
> reverse the list first (and this can be expensive if the list is large,
> since this is an O(n) operation).
Have you actually looked at the queue depth of this thing? Large queues
are a problem for interrupt latency.
next prev parent reply other threads:[~2014-06-04 19:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-04 19:39 [PATCH] smp, ipi: Speed up IPI handling by invoking the callbacks in reverse order Srivatsa S. Bhat
2014-06-04 19:47 ` Peter Zijlstra [this message]
2014-06-04 20:07 ` Srivatsa S. Bhat
2014-06-05 7:26 ` Peter Zijlstra
2014-06-06 7:37 ` Srivatsa S. Bhat
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