linux-kernel - Re: DEFINE_IDA causing memory leaks? (was Re: [PATCH 1/2] virtio: fix memory leak of virtio ida cache layers)

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Message-ID: <20150917171529.GA15447@htj.duckdns.org>
Date:	Thu, 17 Sep 2015 13:15:29 -0400
From:	Tejun Heo <htejun@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, Suman Anna <s-anna@...com>,
	Ohad Ben-Cohen <ohad@...ery.com>, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-scsi@...r.kernel.org, open-iscsi@...glegroups.com
Subject: Re: DEFINE_IDA causing memory leaks? (was  Re: [PATCH 1/2] virtio:
 fix memory leak of virtio ida cache layers)

Hello,

On Thu, Sep 17, 2015 at 09:48:37AM -0700, James Bottomley wrote:
> Well, there's an easy fix for that.  We could have ida_remove() actually
> free the bitmap and not cache it if it's the last layer.  That way ida
> would naturally empty and we wouldn't need a destructor.   Tejun, would
> that work?

Yeah, that definitely is one way to go about it.  It kinda muddles the
purpose of ida_destroy() tho.  I suppose we can rename it to
idr_remove_all() and then do the same to idr.  I'm not particularly
objecting to all that but what's wrong with just calling idr_destroy()
on exit paths?  If missing the call in modules is an issue, maybe we
can just annotate idr/ida with debugobj?

Thanks.

-- 
tejun
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