linux-kernel - Re: [RFC PATCH 00/10] x86: undwarf unwinder

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Message-ID: <c54327dc-75c9-db48-f7c1-59f9fcfca26f@suse.cz>
Date:   Thu, 1 Jun 2017 14:57:21 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC PATCH 00/10] x86: undwarf unwinder

On 06/01/2017, 02:52 PM, Josh Poimboeuf wrote:
>> This is ~ 20 times faster than my DWARF unwinder by a quick measurement
>> (20000 calls to save_stack_trace via single vfs_write).
> 
> Wow!

BTW the most time spent when unwinding DWARF was in those routines
decrypting uleb/sleb128 into u/longs.

thanks,
-- 
js
suse labs