From: Ignat Korchagin <ignat@cloudflare.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Mike Snitzer <snitzer@redhat.com>,
agk@redhat.com, dm-devel@redhat.com, dm-crypt@saout.de,
linux-kernel <linux-kernel@vger.kernel.org>,
kernel-team <kernel-team@cloudflare.com>
Subject: Re: [RFC PATCH 0/1] dm-crypt excessive overhead
Date: Sat, 20 Jun 2020 22:02:36 +0100 [thread overview]
Message-ID: <CALrw=nHZK7JhUO+-vAeMxCZqTBGBkWckBeg56pFuc1bo6yep6A@mail.gmail.com> (raw)
In-Reply-To: <alpine.LRH.2.02.2006201535280.24999@file01.intranet.prod.int.rdu2.redhat.com>
Yes, it should.
I got one when I was testing the first iteration (without the tasklet)
of the patch on an NVME? disk.
On Sat, Jun 20, 2020 at 8:36 PM Mikulas Patocka <mpatocka@redhat.com> wrote:
>
>
>
> On Sat, 20 Jun 2020, Herbert Xu wrote:
>
> > On Fri, Jun 19, 2020 at 02:39:39PM -0400, Mikulas Patocka wrote:
> > >
> > > I'm looking at this and I'd like to know why does the crypto API fail in
> > > hard-irq context and why does it work in tasklet context. What's the exact
> > > reason behind this?
> >
> > You're not supposed to do any real work in IRQ handlers. All
> > the substantial work should be postponed to softirq context.
>
> I see.
>
> BTW - should it also warn if it is running in a process context with
> interrupts disabled?
>
> Mikulas
>
> > Why do you need to do work in hard IRQ context?
> >
> > Cheers,
> > --
> > Email: Herbert Xu <herbert@gondor.apana.org.au>
> > Home Page: http://gondor.apana.org.au/~herbert/
> > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
> >
>
next prev parent reply other threads:[~2020-06-20 21:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-19 16:41 [RFC PATCH 0/1] dm-crypt excessive overhead Ignat Korchagin
2020-06-19 16:41 ` [RFC PATCH 1/1] Add DM_CRYPT_FORCE_INLINE flag to dm-crypt target Ignat Korchagin
2020-06-24 5:04 ` [dm-crypt] " Eric Biggers
2020-06-24 5:21 ` [dm-devel] " Damien Le Moal
2020-06-24 5:27 ` Eric Biggers
2020-06-24 6:46 ` Damien Le Moal
2020-06-24 7:24 ` Damien Le Moal
2020-06-24 7:49 ` Damien Le Moal
2020-06-24 8:24 ` Ignat Korchagin
2020-06-24 16:24 ` Eric Biggers
2020-06-24 17:00 ` Ignat Korchagin
2020-06-24 5:12 ` [dm-devel] " Damien Le Moal
2020-06-19 16:55 ` [RFC PATCH 0/1] dm-crypt excessive overhead Mike Snitzer
2020-06-19 18:39 ` Mikulas Patocka
2020-06-19 19:44 ` Ignat Korchagin
2020-06-20 1:23 ` Herbert Xu
2020-06-20 19:36 ` Mikulas Patocka
2020-06-20 21:02 ` Ignat Korchagin [this message]
2020-06-23 15:33 ` Mike Snitzer
2020-06-23 16:24 ` Ignat Korchagin
2020-06-24 0:23 ` Herbert Xu
2020-06-22 0:45 ` [dm-devel] " Damien Le Moal
2020-06-22 7:55 ` Ignat Korchagin
2020-06-22 8:08 ` Damien Le Moal
2020-06-23 15:01 ` Mike Snitzer
2020-06-23 15:07 ` Ignat Korchagin
2020-06-23 15:22 ` Mike Snitzer
2020-06-24 4:54 ` [dm-devel] " Damien Le Moal
2020-06-24 5:22 ` Mike Snitzer
2020-06-24 8:02 ` Ignat Korchagin
2020-06-24 4:28 ` Damien Le Moal
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