linux-kernel - Re: [PATCH] netns: deinline net

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Date:	Tue, 14 Apr 2015 17:04:41 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Jiri Pirko <jpirko@...hat.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] netns: deinline net_generic()

On 04/14/2015 04:21 PM, Eric Dumazet wrote:
> On Tue, 2015-04-14 at 15:57 +0200, Denys Vlasenko wrote:
> 
>> My allyesconfig, with BUG_ON's commented out:
>>
> 
> Right. But I can tell you nobody uses lockdep on a production kernel.
> 
> Here, at Google, we get what I described.

I'm trying to get to the .config which generates a small function.

So far, with LOCKDEP off, it is still this big:


net_generic:
        call    __fentry__
        pushq   %rbp    #
#APP
# 72 "./arch/x86/include/asm/preempt.h" 1
        incl %gs:__preempt_count(%rip)  # __preempt_count
# 0 "" 2
#NO_APP
        movq    %rsp, %rbp      #,
        pushq   %r12    #
        movq    %rdi, %r12      # net, net
        pushq   %rbx    #
        movl    %esi, %ebx      # id, id
        call    rcu_lock_acquire.constprop.15   #
        movq    4784(%r12), %rax        # MEM[(struct net_generic * const volatile *)net_2(D) + 4784B], _________p1
        decl    %ebx    # tmp65
        movslq  %ebx, %rbx      # tmp65, tmp66
        movq    24(%rax,%rbx,8), %rbx   # _________p1_4->ptr, ptr
        call    rcu_read_unlock #
        movq    %rbx, %rax      # ptr,
        popq    %rbx    #
        popq    %r12    #
        popq    %rbp    #
        ret


Config is attached.

Download attachment "config.gz" of type "application/gzip" (44610 bytes)