From: Peter Zijlstra <peterz@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Masami Hiramatsu <mhiramat@redhat.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Jim Keniston <jkenisto@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
"Frank Ch. Eigler" <fche@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Roland McGrath <roland@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH v2 7/11] Uprobes Implementation
Date: Wed, 12 May 2010 13:12:31 +0200 [thread overview]
Message-ID: <1273662751.1626.35.camel@laptop> (raw)
In-Reply-To: <20100512104138.GM7426@linux.vnet.ibm.com>
On Wed, 2010-05-12 at 16:11 +0530, Srikar Dronamraju wrote:
> > We can't hold mmap_sem (for either read or write -- read would be
> > sufficient to serialize against mmap/mremap/munmap) from atomic uprobe
> > context, what we can do is validate that there is a INT3 on that
> > particular address, a mremap/munmap/munmap+mmap will either end not
> > having a pte entry for the address, or not have the INT3.
>
> Did you mean "We can hold mmap_sem?" Else I am not sure if we can
> traverse the vma. Infact alloc_page_vma() needs mmap_sem to be acquired.
> Please clarify?
OK, so maybe I misunderstood, this is from the INT3 trap handler, right?
We can _not_ take a sleeping lock from trap context. Why would you want
the vma anyway?
next prev parent reply other threads:[~2010-05-12 11:12 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-31 15:51 [PATCH v2 0/11] Uprobes patches Srikar Dronamraju
2010-03-31 15:51 ` [PATCH v2 1/11] Move Macro W to insn.h Srikar Dronamraju
2010-03-31 15:51 ` [PATCH v2 2/11] Move replace_page() to mm/memory.c Srikar Dronamraju
2010-03-31 15:51 ` [PATCH v2 3/11] Enhance replace_page() to support pagecache Srikar Dronamraju
2010-03-31 15:51 ` [PATCH v2 4/11] User Space Breakpoint Assistance Layer Srikar Dronamraju
2010-03-31 15:52 ` [PATCH v2 5/11] X86 details for user space breakpoint assistance Srikar Dronamraju
2010-03-31 15:52 ` [PATCH v2 6/11] Slot allocation for Execution out of line Srikar Dronamraju
2010-03-31 15:52 ` [PATCH v2 7/11] Uprobes Implementation Srikar Dronamraju
2010-04-13 18:35 ` Oleg Nesterov
2010-04-15 9:35 ` Srikar Dronamraju
2010-04-19 19:31 ` Oleg Nesterov
2010-04-20 12:43 ` Srikar Dronamraju
2010-04-20 15:30 ` Oleg Nesterov
2010-04-21 6:59 ` Srikar Dronamraju
2010-04-21 16:05 ` Oleg Nesterov
2010-04-22 13:31 ` Srikar Dronamraju
2010-04-22 15:40 ` Oleg Nesterov
2010-04-23 14:58 ` Srikar Dronamraju
2010-04-23 18:53 ` Oleg Nesterov
2010-05-11 20:47 ` Peter Zijlstra
2010-05-11 20:44 ` Peter Zijlstra
2010-05-11 20:45 ` Peter Zijlstra
2010-05-12 10:31 ` Srikar Dronamraju
2010-05-13 19:40 ` Oleg Nesterov
2010-05-13 19:59 ` Linus Torvalds
2010-05-13 22:12 ` Andi Kleen
2010-05-13 22:25 ` Linus Torvalds
2010-05-14 0:56 ` Roland McGrath
2010-05-14 5:42 ` Srikar Dronamraju
2010-05-11 20:43 ` Peter Zijlstra
2010-05-12 10:41 ` Srikar Dronamraju
2010-05-12 11:12 ` Peter Zijlstra [this message]
2010-05-12 14:24 ` Srikar Dronamraju
2010-05-11 20:32 ` Peter Zijlstra
2010-05-11 20:57 ` Frank Ch. Eigler
2010-05-11 21:01 ` Peter Zijlstra
2010-03-31 15:52 ` [PATCH v2 8/11] X86 details for uprobes Srikar Dronamraju
2010-03-31 15:52 ` [PATCH v2 9/11] Uprobes Documentation patch Srikar Dronamraju
2010-03-31 15:52 ` [PATCH v2 10/11] Uprobes samples Srikar Dronamraju
2010-03-31 15:53 ` [PATCH v2 11/11] Uprobes traceevents patch Srikar Dronamraju
2010-03-31 21:24 ` Steven Rostedt
2010-04-01 4:16 ` Masami Hiramatsu
2010-05-12 14:57 ` Frederic Weisbecker
2010-05-12 11:02 ` Frederic Weisbecker
2010-05-12 14:34 ` Srikar Dronamraju
2010-05-12 15:15 ` Frederic Weisbecker
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