From: "Alex Bennée" <alex.bennee@linaro.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-trivial@nongnu.org, crosthwaitepeter@gmail.com,
qemu-devel@nongnu.org, aurelien@aurel32.net, rth@twiddle.net
Subject: Re: [Qemu-devel] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<pid>.map files
Date: Tue, 04 Aug 2015 08:39:45 +0100 [thread overview]
Message-ID: <87k2tblcxq.fsf@linaro.org> (raw)
In-Reply-To: <55BF6F68.1090103@redhat.com>
Paolo Bonzini <pbonzini@redhat.com> writes:
> On 03/08/2015 11:14, Alex Bennée wrote:
>> This allows the perf tool to map samples to each individual translation
>> block. This could be expanded for user space but currently it gives
>> enough information to find any hotblocks by other means.
>>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>
> What happens if you encounter a tb_flush?
At the point of a tb_flush all bets are off as we will re-generate all
the blocks at potentially different locations in the translation buffer.
However for most analysis cases you are unlikely to cause the code
buffer to overflow. Most other uses of tb_flush are the result
debugging.
I could add a printf when --perfmap is enabled to flag when a flush
happens to signal to the user? I guess some more caveats in the flag
description wouldn't hurt.
We could consider truncating and re-starting the JIT dump at each flush?
>
> Paolo
--
Alex Bennée
next prev parent reply other threads:[~2015-08-04 7:39 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-03 9:14 [Qemu-devel] [PATCH v4 00/11] qemu-log, perfmap and other logging tweaks Alex Bennée
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<pid>.map files Alex Bennée
2015-08-03 13:40 ` Paolo Bonzini
2015-08-04 7:39 ` Alex Bennée [this message]
2015-08-04 10:02 ` Paolo Bonzini
2015-08-04 11:59 ` Aurelien Jarno
2015-08-04 12:55 ` Alex Bennée
2015-08-04 19:01 ` Aurelien Jarno
2015-08-04 12:15 ` Aurelien Jarno
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 02/11] tcg: light re-factor and pass down TranslationBlock Alex Bennée
2015-08-04 12:36 ` Aurelien Jarno
2016-02-03 18:38 ` Alex Bennée
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 03/11] qemu-log: correct help text for -d cpu Alex Bennée
2015-08-04 12:16 ` Aurelien Jarno
2015-08-04 15:11 ` Alex Bennée
2015-08-04 15:15 ` Peter Maydell
2015-08-04 15:21 ` Richard Henderson
2015-08-04 17:22 ` Alex Bennée
2015-08-04 18:09 ` Richard Henderson
2015-08-04 19:08 ` Alex Bennée
2015-08-04 19:16 ` Richard Henderson
2015-09-15 19:28 ` Peter Maydell
2015-09-15 19:41 ` Richard Henderson
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 04/11] qemu-log: Avoid function call for disabled qemu_log_mask logging Alex Bennée
2015-08-04 12:17 ` Aurelien Jarno
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 05/11] qemu-log: Improve the "exec" TB execution logging Alex Bennée
2015-08-04 12:17 ` Aurelien Jarno
2015-08-10 19:40 ` Christopher Covington
2016-02-03 18:45 ` Alex Bennée
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 06/11] qemu-log: support simple pid substitution in logfile Alex Bennée
2015-08-04 12:17 ` Aurelien Jarno
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 07/11] qemu-log: new option -dfilter to limit output Alex Bennée
2015-08-04 12:21 ` Aurelien Jarno
2015-08-10 16:59 ` Christopher Covington
2015-08-10 18:30 ` Alex Bennée
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 08/11] qemu-log: dfilter-ise exec, out_asm, and op_opt Alex Bennée
2015-08-04 12:22 ` Aurelien Jarno
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 09/11] target-arm: dfilter support for in_asm, op, opt_op Alex Bennée
2015-08-04 12:23 ` Aurelien Jarno
2015-08-04 14:44 ` Richard Henderson
2015-08-04 17:26 ` Alex Bennée
2015-08-04 18:11 ` Richard Henderson
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 10/11] vl.c: log system invocation when enabled Alex Bennée
2015-08-04 12:30 ` Aurelien Jarno
2015-08-04 12:40 ` Peter Maydell
2015-08-04 12:46 ` Aurelien Jarno
2015-08-04 13:14 ` Peter Maydell
2015-08-04 15:12 ` Alex Bennée
2015-08-03 9:14 ` [Qemu-devel] [PATCH v4 11/11] cputlb: modernise the debug support Alex Bennée
2015-08-04 12:33 ` Aurelien Jarno
2016-02-03 18:54 ` Alex Bennée
2016-02-03 19:05 ` Peter Maydell
2016-02-04 7:03 ` Alex Bennée
2015-09-11 7:54 ` [Qemu-devel] [PATCH v4 00/11] qemu-log, perfmap and other logging tweaks Michael Tokarev
2015-09-11 14:07 ` Alex Bennée
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