From: Matthew Wilcox <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
Nicholas Bellinger <nab@linux-iscsi.org>,
Shaohua Li <shli@fb.com>,
Kent Overstreet <kent.overstreet@gmail.com>,
Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH] percpu_ida: Use _irqsave() instead of local_irq_save() + spin_lock
Date: Fri, 4 May 2018 20:51:54 -0700 [thread overview]
Message-ID: <20180505035154.GB20495@bombadil.infradead.org> (raw)
In-Reply-To: <20180504162216.ae91654b68eddafe38df7d7f@linux-foundation.org>
On Fri, May 04, 2018 at 04:22:16PM -0700, Andrew Morton wrote:
> I'm feeling a bit hostile toward lib/percpu_ida.c in general ;) It has
> very few users and seems rather complicated (what's with that
> schedule() in percpu_ida_alloc?). I'm suspecting and hoping that if
> someone can figure out what the requirements were, this could all be
> zapped and reimplemented using something else which we already have.
Note that I have no code in percpu_ida ... it's quite different from
the regular IDA. But I have noticed the stunning similarity between the
percpu_ida and the code in lib/sbitmap.c. I have no idea which one is
better, but they're essentially doing the same thing.
next prev parent reply other threads:[~2018-05-05 3:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 15:32 [PATCH] percpu_ida: Use _irqsave() instead of local_irq_save() + spin_lock Sebastian Andrzej Siewior
2018-05-04 23:22 ` Andrew Morton
2018-05-05 3:51 ` Matthew Wilcox [this message]
2018-05-05 14:10 ` Jens Axboe
2018-05-05 14:42 ` Jens Axboe
2018-05-05 15:52 ` Matthew Wilcox
2018-05-07 13:47 ` Matthew Wilcox
2018-05-07 21:34 ` Jens Axboe
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