linux-kernel - Re: [PATCH v1 2/2] zram: remove init_lock in zram_make

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Message-ID: <20150129022241.GA2555@swordfish>
Date:	Thu, 29 Jan 2015 11:22:41 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Ganesh Mahendran <opensource.ganesh@...il.com>,
	sergey.senozhatsky.work@...il.com
Subject: Re: [PATCH v1 2/2] zram: remove init_lock in zram_make_request

On (01/29/15 11:01), Minchan Kim wrote:
> On Thu, Jan 29, 2015 at 10:57:38AM +0900, Sergey Senozhatsky wrote:
> > On Thu, Jan 29, 2015 at 8:33 AM, Minchan Kim <minchan@...nel.org> wrote:
> > > On Wed, Jan 28, 2015 at 11:56:51PM +0900, Sergey Senozhatsky wrote:
> > > > I don't like re-introduced ->init_done.
> > > > another idea... how about using `zram->disksize == 0' instead of
> > > > `->init_done' (previously `->meta != NULL')? should do the trick.
> > >
> > > It could be.
> > >
> > >
> > care to change it?
> 
> Will try!
> 
> If it was your concern, I'm happy to remove the check.(ie, actually,
> I realized that after I push the button to send). Thanks!
> 

Thanks a lot, Minchan.

and, guys, sorry for previous html email (I'm sure I toggled the "plain
text" mode in gmail web-interface, but somehow it has different meaning
in gmail world).

I'm still concerned about performance numbers that I see on my x86_64.
it's not always, but mostly slower. I'll give it another try (disable
lockdep, etc.), but if we lose 10% on average then, sorry, I'm not so
positive about srcu change and will tend to vote for your initial commit
that simply moved meta free() out of init_lock and left locking as is
(lockdep warning would have been helpful there, because otherwise it
just looked like we change code w/o any reason).

what do you thunk?

	-ss
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