linux-kernel - Re: [PATCH 0/2] Ajust lockdep static allocations

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Message-ID: <842fdad9-638e-f98c-5e3d-c3e698943e30@oracle.com>
Date:   Fri, 23 Sep 2016 10:15:46 -0500
From:   Babu Moger <babu.moger@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, akpm@...ux-foundation.org, keescook@...omium.org,
        dan.j.williams@...el.com, aryabinin@...tuozzo.com, tj@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Ajust lockdep static allocations



On 9/23/2016 10:04 AM, Peter Zijlstra wrote:
> On Fri, Sep 23, 2016 at 09:50:52AM -0500, Babu Moger wrote:
>>> Why can't you boot? You have that little memories? 4MB doesn't seem like
>>> a worthwhile amount of memory.
>>>
>>> Also, you didn't say.  This seems a somewhat crucial point.
>>      Correct, We can't boot with lockdep. Sorry I did not make that clear.
>> We have a limit on static size of the kernel.
> This stuff should be in .bss not .data. It should not affect the static
> size at all. Or am I misunderstanding things?
  Here it is.
$ ./scripts/bloat-o-meter vmlinux.lockdep.small vmlinux.lockdep.big
add/remove: 0/0 grow/shrink: 5/0 up/down: 4653056/0 (4653056)
function                                     old     new   delta
stack_trace                              2097152 4194304 +2097152
lock_chains                              1048576 2097152 +1048576
list_entries                             1048576 2097152 +1048576
chain_hlocks                              327680  655360 +327680
chainhash_table                           131072  262144 +131072
Total: Before=21046200, After=25699256, chg 22.000000%