From: Sam Ben <sam.bennn@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>, Robin Holt <holt@sgi.com>,
Robert Richter <rric@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>, Nate Zimmer <nzimmer@sgi.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>, Rob Landley <rob@landley.net>,
Mike Travis <travis@sgi.com>,
Daniel J Blueman <daniel@numascale-asia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Greg KH <gregkh@linuxfoundation.org>,
Yinghai Lu <yinghai@kernel.org>, Mel Gorman <mgorman@suse.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: boot tracing
Date: Mon, 15 Jul 2013 09:38:39 +0800 [thread overview]
Message-ID: <51E3529F.6070909@gmail.com> (raw)
In-Reply-To: <20130712085341.GC4328@gmail.com>
On 07/12/2013 04:53 PM, Ingo Molnar wrote:
> * Borislav Petkov <bp@alien8.de> wrote:
>
>> On Fri, Jul 12, 2013 at 10:27:56AM +0200, Ingo Molnar wrote:
>>> Robert Richter and Boris Petkov are working on 'persistent events'
>>> support for perf, which will eventually allow boot time profiling -
>>> I'm not sure if the patches and the tooling support is ready enough
>>> yet for your purposes.
>> Nope, not yet but we're getting there.
>>
>>> Robert, Boris, the following workflow would be pretty intuitive:
>>>
>>> - kernel developer sets boot flag: perf=boot,freq=1khz,size=16MB
>> What does perf=boot mean? I assume boot tracing.
> In this case it would mean boot profiling - i.e. a cycles hardware-PMU
> event collecting into a perf trace buffer as usual.
>
> Essentially a 'perf record -a' work-alike, just one that gets activated as
> early as practical, and which would allow the profiling of memory
> initialization.
>
> Now, one extra complication here is that to be able to profile buddy
> allocator this persistent event would have to work before the buddy
> allocator is active :-/ So this sort of profiling would have to use
> memblock_alloc().
Could perf=boot be used to sample the performance of memblock subsystem?
I think the perf subsystem is too late to be initialized and monitor this.
>
> Just wanted to highlight this usecase, we might eventually want to support
> it.
>
> [ Note that this is different from boot tracing of one or more trace
> events - but it's a conceptually pretty close cousin. ]
>
> Thanks,
>
> Ingo
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next prev parent reply other threads:[~2013-07-15 1:38 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-12 2:03 [RFC 0/4] Transparent on-demand struct page initialization embedded in the buddy allocator Robin Holt
2013-07-12 2:03 ` [RFC 1/4] memblock: Introduce a for_each_reserved_mem_region iterator Robin Holt
2013-07-12 2:03 ` [RFC 2/4] Have __free_pages_memory() free in larger chunks Robin Holt
2013-07-12 7:45 ` Robin Holt
2013-07-13 3:08 ` Yinghai Lu
2013-07-16 13:02 ` Sam Ben
2013-07-23 15:32 ` Johannes Weiner
2013-07-12 2:03 ` [RFC 3/4] Seperate page initialization into a separate function Robin Holt
2013-07-13 3:06 ` Yinghai Lu
2013-07-15 3:19 ` Robin Holt
2013-07-12 2:03 ` [RFC 4/4] Sparse initialization of struct page array Robin Holt
2013-07-13 4:19 ` Yinghai Lu
2013-07-13 4:39 ` H. Peter Anvin
2013-07-13 5:31 ` Yinghai Lu
2013-07-13 5:38 ` H. Peter Anvin
2013-07-15 14:08 ` Nathan Zimmer
2013-07-15 17:45 ` Nathan Zimmer
2013-07-15 17:54 ` H. Peter Anvin
2013-07-15 18:26 ` Robin Holt
2013-07-15 18:29 ` H. Peter Anvin
2013-07-23 8:32 ` Ingo Molnar
2013-07-23 11:09 ` Robin Holt
2013-07-23 11:15 ` Robin Holt
2013-07-23 11:41 ` Robin Holt
2013-07-23 11:50 ` Robin Holt
2013-07-16 10:26 ` Robin Holt
2013-07-25 2:25 ` Robin Holt
2013-07-25 12:50 ` Yinghai Lu
2013-07-25 13:42 ` Robin Holt
2013-07-25 13:52 ` Yinghai Lu
2013-07-15 21:30 ` Andrew Morton
2013-07-16 10:38 ` Robin Holt
2013-07-12 8:27 ` [RFC 0/4] Transparent on-demand struct page initialization embedded in the buddy allocator Ingo Molnar
2013-07-12 8:47 ` boot tracing Borislav Petkov
2013-07-12 8:53 ` Ingo Molnar
2013-07-15 1:38 ` Sam Ben [this message]
2013-07-23 8:18 ` Ingo Molnar
2013-07-12 9:19 ` [RFC 0/4] Transparent on-demand struct page initialization embedded in the buddy allocator Robert Richter
2013-07-15 15:16 ` Robin Holt
2013-07-16 8:55 ` Joonsoo Kim
2013-07-16 9:08 ` Borislav Petkov
2013-07-23 8:20 ` Ingo Molnar
2013-07-15 15:00 ` Robin Holt
2013-07-17 5:17 ` Sam Ben
2013-07-17 9:30 ` Robin Holt
2013-07-19 23:51 ` Yinghai Lu
2013-07-22 6:13 ` Robin Holt
2013-08-02 17:44 ` [RFC v2 0/5] " Nathan Zimmer
2013-08-02 17:44 ` [RFC v2 1/5] memblock: Introduce a for_each_reserved_mem_region iterator Nathan Zimmer
2013-08-02 17:44 ` [RFC v2 2/5] Have __free_pages_memory() free in larger chunks Nathan Zimmer
2013-08-02 17:44 ` [RFC v2 3/5] Move page initialization into a separate function Nathan Zimmer
2013-08-02 17:44 ` [RFC v2 4/5] Only set page reserved in the memblock region Nathan Zimmer
2013-08-03 20:04 ` Nathan Zimmer
2013-08-02 17:44 ` [RFC v2 5/5] Sparse initialization of struct page array Nathan Zimmer
2013-08-05 9:58 ` [RFC v2 0/5] Transparent on-demand struct page initialization embedded in the buddy allocator Ingo Molnar
2013-08-12 21:54 ` [RFC v3 " Nathan Zimmer
2013-08-12 21:54 ` [RFC v3 1/5] memblock: Introduce a for_each_reserved_mem_region iterator Nathan Zimmer
2013-08-12 21:54 ` [RFC v3 2/5] Have __free_pages_memory() free in larger chunks Nathan Zimmer
2013-08-12 21:54 ` [RFC v3 3/5] Move page initialization into a separate function Nathan Zimmer
2013-08-12 21:54 ` [RFC v3 4/5] Only set page reserved in the memblock region Nathan Zimmer
2013-08-12 21:54 ` [RFC v3 5/5] Sparse initialization of struct page array Nathan Zimmer
2013-08-13 10:58 ` [RFC v3 0/5] Transparent on-demand struct page initialization embedded in the buddy allocator Ingo Molnar
2013-08-13 17:09 ` Linus Torvalds
2013-08-13 17:23 ` H. Peter Anvin
2013-08-13 17:33 ` Mike Travis
2013-08-13 17:51 ` Linus Torvalds
2013-08-13 18:04 ` Mike Travis
2013-08-13 19:06 ` Mike Travis
2013-08-13 20:24 ` Yinghai Lu
2013-08-13 20:37 ` Mike Travis
2013-08-13 21:35 ` Nathan Zimmer
2013-08-13 23:10 ` Nathan Zimmer
2013-08-13 23:55 ` Linus Torvalds
2013-08-14 11:27 ` Ingo Molnar
2013-08-14 11:05 ` Ingo Molnar
2013-08-14 22:15 ` Nathan Zimmer
2013-08-16 16:36 ` Dave Hansen
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