From: Peter Zijlstra <peterz@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Oleg Nesterov <oleg@redhat.com>, Mark Wielaard <mjw@redhat.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
Naren A Devaiah <naren.devaiah@in.ibm.com>,
Jim Keniston <jkenisto@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
"Frank Ch. Eigler" <fche@redhat.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Subject: Re: [PATCHv11 2.6.36-rc2-tip 3/15] 3: uprobes: Slot allocation for Execution out of line(XOL)
Date: Mon, 06 Sep 2010 20:28:03 +0200 [thread overview]
Message-ID: <1283797683.1930.758.camel@laptop> (raw)
In-Reply-To: <20100906175957.GH14891@linux.vnet.ibm.com>
On Mon, 2010-09-06 at 23:29 +0530, Srikar Dronamraju wrote:
> > The current approach limits the number of probes to what fits in a page.
> > The slot per cpu approach will have no such limit.
>
>
> yes the limit on number of probes is a limitation. For now the
> implementation would be straight and easy. We could either rework on the
> algorithm or add more pages depending on how often uprobes gets used.
Right, but with the proposed slot-per-cpu we'd be able to have unlimited
active probes within that single page, even with boosted probes,
assuming 16 bytes per instruction:
push reg
mov reg,foo
insn
pop reg
jmp
and cacheline alignment we'd end up with 128 bytes per slot, we can
service 32 cpus per page. Which, for now, means that all my machines
need but a single page.
next prev parent reply other threads:[~2010-09-06 18:28 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-25 13:41 [PATCHv11 2.6.36-rc2-tip 0/15] 0: Uprobes Patches Srikar Dronamraju
2010-08-25 13:41 ` [PATCHv11 2.6.36-rc2-tip 1/15] 1: mm: Move replace_page() / write_protect_page() to mm/memory.c Srikar Dronamraju
2010-08-25 13:41 ` [PATCHv11 2.6.36-rc2-tip 2/15] 2: uprobes: Breakpoint insertion/removal in user space applications Srikar Dronamraju
2010-09-01 19:38 ` Peter Zijlstra
2010-08-25 13:41 ` [PATCHv11 2.6.36-rc2-tip 3/15] 3: uprobes: Slot allocation for Execution out of line(XOL) Srikar Dronamraju
2010-09-01 20:13 ` Peter Zijlstra
2010-09-03 16:40 ` Srikar Dronamraju
2010-09-03 16:51 ` Peter Zijlstra
2010-09-03 17:26 ` Srikar Dronamraju
2010-09-03 17:41 ` Peter Zijlstra
2010-09-06 5:38 ` Srikar Dronamraju
2010-09-03 17:25 ` Peter Zijlstra
2010-09-02 8:23 ` Peter Zijlstra
2010-09-02 17:47 ` Srikar Dronamraju
2010-09-03 7:26 ` Peter Zijlstra
2010-09-06 17:59 ` Srikar Dronamraju
2010-09-06 18:20 ` Peter Zijlstra
2010-09-06 18:28 ` Peter Zijlstra [this message]
2010-08-25 13:42 ` [PATCHv11 2.6.36-rc2-tip 4/15] 4: uprobes: x86 specific functions for user space breakpointing Srikar Dronamraju
2010-09-03 10:26 ` Andi Kleen
2010-09-03 17:48 ` Srikar Dronamraju
2010-09-03 18:00 ` Peter Zijlstra
2010-09-06 7:53 ` Andi Kleen
2010-09-06 13:44 ` Srikar Dronamraju
2010-09-06 14:16 ` Andi Kleen
2010-09-07 0:56 ` Masami Hiramatsu
2010-08-25 13:42 ` [PATCHv11 2.6.36-rc2-tip 5/15] 5: uprobes: Uprobes (un)registration and exception handling Srikar Dronamraju
2010-09-01 21:43 ` Peter Zijlstra
2010-09-02 8:12 ` Peter Zijlstra
2010-09-03 16:42 ` Srikar Dronamraju
2010-09-03 17:19 ` Peter Zijlstra
2010-09-06 17:46 ` Srikar Dronamraju
2010-09-06 18:15 ` Peter Zijlstra
2010-09-06 18:15 ` Peter Zijlstra
2010-09-07 6:48 ` Srikar Dronamraju
2010-09-07 9:33 ` Peter Zijlstra
2010-09-07 11:51 ` Srikar Dronamraju
2010-09-07 12:25 ` Peter Zijlstra
2010-09-06 18:25 ` Mathieu Desnoyers
2010-09-06 20:40 ` Christoph Hellwig
2010-09-06 21:06 ` Peter Zijlstra
2010-09-06 21:12 ` Christoph Hellwig
2010-09-06 21:18 ` Peter Zijlstra
2010-09-07 12:02 ` Srikar Dronamraju
2010-09-07 16:47 ` Mathieu Desnoyers
2010-09-03 17:27 ` Peter Zijlstra
2010-09-01 21:46 ` Peter Zijlstra
2010-08-25 13:42 ` [PATCHv11 2.6.36-rc2-tip 6/15] 6: uprobes: X86 support for Uprobes Srikar Dronamraju
2010-08-25 13:42 ` [PATCHv11 2.6.36-rc2-tip 7/15] 7: uprobes: Uprobes Documentation Srikar Dronamraju
2010-08-25 13:42 ` [PATCHv11 2.6.36-rc2-tip 8/15] 8: tracing: Extract out common code for kprobes/uprobes traceevents Srikar Dronamraju
2010-08-25 13:43 ` [PATCHv11 2.6.36-rc2-tip 9/15] 9: tracing: uprobes trace_event interface Srikar Dronamraju
2010-08-25 13:43 ` [PATCHv11 2.6.36-rc2-tip 10/15] 10: tracing: config option to enable both kprobe-tracer and uprobe-tracer Srikar Dronamraju
2010-08-26 6:02 ` Masami Hiramatsu
2010-08-27 9:31 ` Srikar Dronamraju
2010-08-27 11:04 ` Masami Hiramatsu
2010-08-27 12:17 ` Srikar Dronamraju
2010-08-27 15:37 ` Masami Hiramatsu
2010-08-27 14:10 ` [PATCHv11a " Srikar Dronamraju
2010-08-25 13:43 ` [PATCHv11 2.6.36-rc2-tip 11/15] 11: perf: list symbols in a dso in ascending order Srikar Dronamraju
2010-08-25 23:21 ` Arnaldo Carvalho de Melo
2010-08-26 4:32 ` Srikar Dronamraju
2010-08-30 8:35 ` [tip:perf/core] perf symbols: List symbols in a dso in ascending name order tip-bot for Srikar Dronamraju
2010-08-25 13:43 ` [PATCHv11 2.6.36-rc2-tip 12/15] 12: perf: show possible probes in a given file Srikar Dronamraju
2010-08-27 14:21 ` [PATCHv11a " Srikar Dronamraju
2010-10-20 9:56 ` Masami Hiramatsu
2010-08-25 13:43 ` [PATCHv11 2.6.36-rc2-tip 13/15] 13: perf: Loop thro each of the maps in a map_group Srikar Dronamraju
2010-08-25 13:44 ` [PATCHv11 2.6.36-rc2-tip 14/15] 14: perf: perf interface for uprobes Srikar Dronamraju
2010-08-25 13:44 ` [PATCHv11 2.6.36-rc2-tip 15/15] 15: perf: Show Potential probe points Srikar Dronamraju
2010-10-29 9:23 ` [PATCHv11 2.6.36-rc2-tip 0/15] 0: Uprobes Patches Christoph Hellwig
2010-10-29 10:48 ` Srikar Dronamraju
2010-11-04 18:45 ` Christoph Hellwig
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