From: Oleg Nesterov <oleg@redhat.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Anton Arapov <aarapov@redhat.com>,
David Smith <dsmith@redhat.com>,
"Frank Ch. Eigler" <fche@redhat.com>,
Martin Cermak <mcermak@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] uprobes: Change uprobe_copy_process() to dup xol_area
Date: Wed, 16 Oct 2013 18:09:39 +0200 [thread overview]
Message-ID: <20131016160939.GA13405@redhat.com> (raw)
In-Reply-To: <20131016125327.GI19729@linux.vnet.ibm.com>
On 10/16, Srikar Dronamraju wrote:
>
> * Oleg Nesterov <oleg@redhat.com> [2013-10-13 21:18:44]:
>
> > We know that this vaddr is fine for install_special_mapping(), the
> > necessary hole was recently "created" by dup_mmap() which skips the
> > parent's VM_DONTCOPY area, and nobody else could use the new mm.
>
>
> I was actually thinking if we can remove the VM_DONTCOPY from
> install_special_mapping,
I considered this option. I even thought about playing with vm_flags
in uprobe_start/stop_dup_mmap ;)
> But there are obvious issues with that approach
and we simply can't do this. Unlike, say, vdso xol vma can not be
cloned automatically, we obviously can't use the same area->page.
Plus we need to dup area itself, at least for ->bitmap.
> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Thanks!
Oleg.
next prev parent reply other threads:[~2013-10-16 16:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-13 19:18 [PATCH 0/5] uprobes: fix fork() with the pending ret-probe(s) Oleg Nesterov
2013-10-13 19:18 ` [PATCH 1/5] uprobes: Change the callsite of uprobe_copy_process() Oleg Nesterov
2013-10-16 12:37 ` Srikar Dronamraju
2013-10-13 19:18 ` [PATCH 2/5] uprobes: Introduce __create_xol_area() Oleg Nesterov
2013-10-16 12:41 ` Srikar Dronamraju
2013-10-16 12:50 ` Srikar Dronamraju
2013-10-13 19:18 ` [PATCH 3/5] uprobes: Teach __create_xol_area() to accept the predefined vaddr Oleg Nesterov
2013-10-16 12:43 ` Srikar Dronamraju
2013-10-13 19:18 ` [PATCH 4/5] uprobes: Change uprobe_copy_process() to dup return_instances Oleg Nesterov
2013-10-14 18:45 ` Peter Zijlstra
2013-10-14 19:00 ` Oleg Nesterov
2013-10-16 12:47 ` Srikar Dronamraju
2013-10-13 19:18 ` [PATCH 5/5] uprobes: Change uprobe_copy_process() to dup xol_area Oleg Nesterov
2013-10-14 14:09 ` Peter Zijlstra
2013-10-14 14:55 ` Oleg Nesterov
2013-10-14 15:47 ` Peter Zijlstra
2013-10-16 12:53 ` Srikar Dronamraju
2013-10-16 16:09 ` Oleg Nesterov [this message]
2013-10-18 15:49 ` Oleg Nesterov
2013-10-14 18:29 ` [PATCH 0/5] uprobes: fix fork() with the pending ret-probe(s) Oleg Nesterov
2013-10-16 17:38 ` Oleg Nesterov
2013-10-16 17:39 ` [PATCH 6/5] uprobes: Teach uprobe_copy_process() to handle CLONE_VFORK Oleg Nesterov
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