From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: torvalds@linux-foundation.org, paulmck@linux.vnet.ibm.com,
tglx@linutronix.de, akpm@linux-foundation.org, riel@redhat.com,
mgorman@suse.de, oleg@redhat.com, mingo@redhat.com,
minchan@kernel.org, kamezawa.hiroyu@jp.fujitsu.com,
viro@zeniv.linux.org.uk, dave@stgolabs.net,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC][PATCH 4/6] SRCU free VMAs
Date: Thu, 23 Oct 2014 18:14:45 +0800 [thread overview]
Message-ID: <5448D515.90006@cn.fujitsu.com> (raw)
In-Reply-To: <20141020222841.419869904@infradead.org>
>
> +struct vm_area_struct *find_vma_srcu(struct mm_struct *mm, unsigned long addr)
> +{
> + struct vm_area_struct *vma;
> + unsigned int seq;
> +
> + WARN_ON_ONCE(!srcu_read_lock_held(&vma_srcu));
> +
> + do {
> + seq = read_seqbegin(&mm->mm_seq);
> + vma = __find_vma(mm, addr);
will the __find_vma() loops for ever due to the rotations in the RBtree?
> + } while (read_seqretry(&mm->mm_seq, seq));
> +
> + return vma;
> +}
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: <torvalds@linux-foundation.org>, <paulmck@linux.vnet.ibm.com>,
<tglx@linutronix.de>, <akpm@linux-foundation.org>,
<riel@redhat.com>, <mgorman@suse.de>, <oleg@redhat.com>,
<mingo@redhat.com>, <minchan@kernel.org>,
<kamezawa.hiroyu@jp.fujitsu.com>, <viro@zeniv.linux.org.uk>,
<dave@stgolabs.net>, <linux-kernel@vger.kernel.org>,
<linux-mm@kvack.org>
Subject: Re: [RFC][PATCH 4/6] SRCU free VMAs
Date: Thu, 23 Oct 2014 18:14:45 +0800 [thread overview]
Message-ID: <5448D515.90006@cn.fujitsu.com> (raw)
In-Reply-To: <20141020222841.419869904@infradead.org>
>
> +struct vm_area_struct *find_vma_srcu(struct mm_struct *mm, unsigned long addr)
> +{
> + struct vm_area_struct *vma;
> + unsigned int seq;
> +
> + WARN_ON_ONCE(!srcu_read_lock_held(&vma_srcu));
> +
> + do {
> + seq = read_seqbegin(&mm->mm_seq);
> + vma = __find_vma(mm, addr);
will the __find_vma() loops for ever due to the rotations in the RBtree?
> + } while (read_seqretry(&mm->mm_seq, seq));
> +
> + return vma;
> +}
next prev parent reply other threads:[~2014-10-23 10:11 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 21:56 [RFC][PATCH 0/6] Another go at speculative page faults Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 1/6] mm: Dont assume page-table invariance during faults Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 2/6] mm: Prepare for FAULT_FLAG_SPECULATIVE Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 3/6] mm: VMA sequence count Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-22 11:26 ` Kirill A. Shutemov
2014-10-22 11:26 ` Kirill A. Shutemov
2014-10-22 11:39 ` Peter Zijlstra
2014-10-22 11:39 ` Peter Zijlstra
2014-10-22 11:53 ` Kirill A. Shutemov
2014-10-22 11:53 ` Kirill A. Shutemov
2014-10-22 12:15 ` Peter Zijlstra
2014-10-22 12:15 ` Peter Zijlstra
2014-10-22 13:44 ` Peter Zijlstra
2014-10-22 13:44 ` Peter Zijlstra
2014-10-23 12:36 ` Kirill A. Shutemov
2014-10-23 12:36 ` Kirill A. Shutemov
2014-10-23 14:22 ` Peter Zijlstra
2014-10-23 14:22 ` Peter Zijlstra
2014-10-23 15:05 ` Kirill A. Shutemov
2014-10-23 15:05 ` Kirill A. Shutemov
2014-10-20 21:56 ` [RFC][PATCH 4/6] SRCU free VMAs Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-20 23:41 ` Linus Torvalds
2014-10-20 23:41 ` Linus Torvalds
2014-10-21 8:07 ` Peter Zijlstra
2014-10-21 8:07 ` Peter Zijlstra
2014-10-24 15:16 ` Christoph Lameter
2014-10-24 15:16 ` Christoph Lameter
2014-10-24 15:51 ` Peter Zijlstra
2014-10-24 15:51 ` Peter Zijlstra
2014-10-24 17:08 ` Christoph Lameter
2014-10-24 17:08 ` Christoph Lameter
2014-10-21 8:22 ` Peter Zijlstra
2014-10-21 8:22 ` Peter Zijlstra
2014-10-23 10:14 ` Lai Jiangshan [this message]
2014-10-23 10:14 ` Lai Jiangshan
2014-10-23 11:03 ` Peter Zijlstra
2014-10-23 11:03 ` Peter Zijlstra
2014-10-24 3:33 ` Lai Jiangshan
2014-10-24 3:33 ` Lai Jiangshan
2014-10-24 7:26 ` Peter Zijlstra
2014-10-24 7:26 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 5/6] mm: Provide speculative fault infrastructure Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-21 8:35 ` Kirill A. Shutemov
2014-10-21 8:35 ` Kirill A. Shutemov
2014-10-21 10:41 ` Peter Zijlstra
2014-10-21 10:41 ` Peter Zijlstra
2014-10-21 19:00 ` Peter Zijlstra
2014-10-21 19:00 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 6/6] mm,x86: Add speculative pagefault handling Peter Zijlstra
2014-10-20 21:56 ` Peter Zijlstra
2014-10-21 0:07 ` [RFC][PATCH 0/6] Another go at speculative page faults Andy Lutomirski
2014-10-21 0:07 ` Andy Lutomirski
2014-10-21 8:11 ` Peter Zijlstra
2014-10-21 8:11 ` Peter Zijlstra
2014-10-21 16:23 ` Ingo Molnar
2014-10-21 16:23 ` Ingo Molnar
2014-10-21 17:09 ` Kirill A. Shutemov
2014-10-21 17:09 ` Kirill A. Shutemov
2014-10-21 17:56 ` Peter Zijlstra
2014-10-21 17:56 ` Peter Zijlstra
2014-10-23 10:40 ` Lai Jiangshan
2014-10-23 10:40 ` Lai Jiangshan
2014-10-23 11:04 ` Peter Zijlstra
2014-10-23 11:04 ` Peter Zijlstra
2014-10-24 7:54 ` Ingo Molnar
2014-10-24 7:54 ` Ingo Molnar
2014-10-24 13:14 ` Peter Zijlstra
2014-10-24 13:14 ` Peter Zijlstra
2014-10-28 5:32 ` Namhyung Kim
2014-10-28 5:32 ` Namhyung Kim
2014-10-21 17:25 ` Peter Zijlstra
2014-10-21 17:25 ` Peter Zijlstra
2014-10-22 12:35 ` Ingo Molnar
2014-10-22 12:35 ` Ingo Molnar
2014-10-22 7:34 ` Davidlohr Bueso
2014-10-22 7:34 ` Davidlohr Bueso
2014-10-22 11:29 ` Kirill A. Shutemov
2014-10-22 11:29 ` Kirill A. Shutemov
2014-10-22 11:45 ` Peter Zijlstra
2014-10-22 11:45 ` Peter Zijlstra
2014-10-22 11:55 ` Kirill A. Shutemov
2014-10-22 11:55 ` Kirill A. Shutemov
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=5448D515.90006@cn.fujitsu.com \
--to=laijs@cn.fujitsu.com \
--cc=akpm@linux-foundation.org \
--cc=dave@stgolabs.net \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=minchan@kernel.org \
--cc=mingo@redhat.com \
--cc=oleg@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=riel@redhat.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
/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.