From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>,
linux-ia64@vger.kernel.org, avagin@virtuozzo.com,
peterz@infradead.org, hpa@zytor.com, gorcunov@virtuozzo.com,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
x86@kernel.org, mingo@redhat.com, mattst88@gmail.com,
fenghua.yu@intel.com, arnd@arndb.de, ink@jurassic.park.msu.ru,
tglx@linutronix.de, rth@twiddle.net, tony.luck@intel.com,
linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
davem@davemloft.net, rientjes@google.com,
viro@zeniv.linux.org.uk
Subject: Re: [PATCH REBASED 3/6] s390: Add __down_read_killable()
Date: Sat, 30 Sep 2017 12:39:46 +0200 [thread overview]
Message-ID: <20170930123946.7bb586c2@mschwideX1> (raw)
In-Reply-To: <20170930123612.0fb250fe@mschwideX1>
On Sat, 30 Sep 2017 12:36:12 +0200
Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
> On Sat, 30 Sep 2017 11:20:02 +0200
> Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
>
> > On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote:
> > > Similar to __down_write_killable(), and read killable primitive.
> > >
> > > Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> > > ---
> > > arch/s390/include/asm/rwsem.h | 18 ++++++++++++++++--
> > > 1 file changed, 16 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
> >
> > FWIW, while looking into this patch I realized that we never optimized our
> > rwsem primitives to make use of new atomic instructions.
> >
> > The generic rwsem header file however does, since it uses atomic ops which
> > we did optimize. Even when compiling for old machines the generic version
> > generates better code. Therefore I will remove the 15 years old s390
> > implementation and switch to the generic version instead.
>
> Take care not to conflict with the queued spinlock/rwlock patches on the
> features branch.
>
> https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=eb3b7b848fb3dd00f7a57d633d4ae4d194aa7865
>
> Me thinks that what you have in mind is already done.
Argh, pitfall rwlock != rwsem. Using the atomic_ops for the rwsem code makes
a lot of sense. Yes, please..
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
WARNING: multiple messages have this Message-ID (diff)
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>,
linux-ia64@vger.kernel.org, avagin@virtuozzo.com,
peterz@infradead.org, hpa@zytor.com, gorcunov@virtuozzo.com,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
x86@kernel.org, mingo@redhat.com, mattst88@gmail.com,
fenghua.yu@intel.com, arnd@arndb.de, ink@jurassic.park.msu.ru,
tglx@linutronix.de, rth@twiddle.net, tony.luck@intel.com,
linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
davem@davemloft.net, rientjes@google.com,
viro@zeniv.linux.org.uk
Subject: Re: [PATCH REBASED 3/6] s390: Add __down_read_killable()
Date: Sat, 30 Sep 2017 10:39:46 +0000 [thread overview]
Message-ID: <20170930123946.7bb586c2@mschwideX1> (raw)
In-Reply-To: <20170930123612.0fb250fe@mschwideX1>
On Sat, 30 Sep 2017 12:36:12 +0200
Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
> On Sat, 30 Sep 2017 11:20:02 +0200
> Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
>
> > On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote:
> > > Similar to __down_write_killable(), and read killable primitive.
> > >
> > > Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> > > ---
> > > arch/s390/include/asm/rwsem.h | 18 ++++++++++++++++--
> > > 1 file changed, 16 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
> >
> > FWIW, while looking into this patch I realized that we never optimized our
> > rwsem primitives to make use of new atomic instructions.
> >
> > The generic rwsem header file however does, since it uses atomic ops which
> > we did optimize. Even when compiling for old machines the generic version
> > generates better code. Therefore I will remove the 15 years old s390
> > implementation and switch to the generic version instead.
>
> Take care not to conflict with the queued spinlock/rwlock patches on the
> features branch.
>
> https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?hþatures&idë3b7b848fb3dd00f7a57d633d4ae4d194aa7865
>
> Me thinks that what you have in mind is already done.
Argh, pitfall rwlock != rwsem. Using the atomic_ops for the rwsem code makes
a lot of sense. Yes, please..
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
next prev parent reply other threads:[~2017-09-30 10:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-29 16:05 [PATCH REBASED 0/6] rwsem: Implement down_read_killable() Kirill Tkhai
2017-09-29 16:05 ` Kirill Tkhai
2017-09-29 16:05 ` [PATCH REBASED 1/6] alpha: Add __down_read_killable() Kirill Tkhai
2017-09-29 16:05 ` Kirill Tkhai
2017-10-10 11:03 ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 2/6] ia64: " Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-10-10 11:04 ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 3/6] s390: " Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-09-30 9:20 ` Heiko Carstens
2017-09-30 9:20 ` Heiko Carstens
2017-09-30 10:36 ` Martin Schwidefsky
2017-09-30 10:36 ` Martin Schwidefsky
2017-09-30 10:38 ` Heiko Carstens
2017-09-30 10:38 ` Heiko Carstens
2017-09-30 10:39 ` Martin Schwidefsky [this message]
2017-09-30 10:39 ` Martin Schwidefsky
2017-10-10 11:04 ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 4/6] x86: " Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-10-10 11:05 ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 5/6] rwsem: Add down_read_killable() Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-10-10 11:05 ` [tip:locking/core] locking/rwsem: " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 6/6] fs: Use killable down_read() in iterate_dir() Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-09-29 16:06 ` Kirill Tkhai
2017-10-10 11:05 ` [tip:locking/core] locking/rwsem, " tip-bot for Kirill Tkhai
2017-10-03 9:03 ` [PATCH REBASED 0/6] rwsem: Implement down_read_killable() Peter Zijlstra
2017-10-03 9:03 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170930123946.7bb586c2@mschwideX1 \
--to=schwidefsky@de.ibm.com \
--cc=arnd@arndb.de \
--cc=avagin@virtuozzo.com \
--cc=davem@davemloft.net \
--cc=fenghua.yu@intel.com \
--cc=gorcunov@virtuozzo.com \
--cc=heiko.carstens@de.ibm.com \
--cc=hpa@zytor.com \
--cc=ink@jurassic.park.msu.ru \
--cc=ktkhai@virtuozzo.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=mattst88@gmail.com \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rientjes@google.com \
--cc=rth@twiddle.net \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=viro@zeniv.linux.org.uk \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.