GNU bug report logs - #2685
Emergency (alloc): Warning: past 85% of memory limit

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Laurent GUERBY <laurent <at> guerby.net>
To: emacs-pretest-bug <at> gnu.org
Subject: Emergency (alloc): Warning: past 85% of memory limit
Date: Mon, 16 Mar 2009 12:13:55 +0100

Hi,

I compiled using GCC 4.3.2 from debian lenny (abi=32):

GNU Emacs 23.0.91.1 (mips64el-unknown-linux-gnu, X toolkit) of
2009-03-15 on gcc51   

When launching emacs (in text mode) I get a *Warnings* window
with the following message:

Emergency (alloc): Warning: past 85% of memory limit

The machine gcc51 has 1GB of RAM so this warning seems surprising.

Sincerely,

Laurent

Message #10 received at 2685 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: John Sullivan <johns <at> fsf.org>
To: 2685 <at> debbugs.gnu.org
Subject: Also seeing this
Date: Wed, 15 Apr 2009 16:32:39 -0400

I'm also seeing this on pretest with emacs compiled on mipsel (mips64),
using gcc-4.3. I have 1GB of RAM, and ulimit returns unlimited.

It's a Debian Lenny system, Linux 2.6.27.

I've verified that it happens with emacs -Q -nw.

Message #15 received at 2685 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Laurent GUERBY <laurent <at> guerby.net>, John Sullivan <johns <at> fsf.org>
Cc: 2685 <at> debbugs.gnu.org
Subject: Re: Emergency (alloc): Warning: past 85% of memory limit
Date: Wed, 20 May 2009 19:32:35 -0400

> I compiled using GCC 4.3.2 from debian lenny (abi=32):
>
> GNU Emacs 23.0.91.1 (mips64el-unknown-linux-gnu, X toolkit) of
> 2009-03-15 on gcc51   
>
> When launching emacs (in text mode) I get a *Warnings* window
> with the following message:
>
> Emergency (alloc): Warning: past 85% of memory limit
>
> The machine gcc51 has 1GB of RAM so this warning seems surprising.

I can't reproduce this on x86.  I don't have access to any mipsel
machine; could either of you give me a temporary account so that I can
try to debug this (if so, please contact me by private email).

Message #20 received at 2685 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: laurent <at> guerby.net
Cc: John Sullivan <johns <at> fsf.org>, 2685 <at> debbugs.gnu.org
Subject: Re: Emergency (alloc): Warning: past 85% of memory limit
Date: Fri, 22 May 2009 00:39:27 -0400

The problem is that Emacs is not determining the start of the data
segment properly on MIPS machines.  In src/m/mips.h, we define
DATA_START as 0x10000000.  There must be a reason for this, but it's
wrong on the machine you provided for testing; there, __morecore reports
the memory break (which must lie inside the data segment) as a value
less than 0x10000000.

If I comment out DATA_START, so that Emacs uses another method to
determine the start of the data segment size, everything seems to work
OK.  But I don't know if this may lead to a different bug elsewhere.

*** trunk/src/m/mips.h.~1.42.~	2009-03-12 09:42:54.000000000 -0400
--- trunk/src/m/mips.h	2009-05-22 00:34:03.000000000 -0400
***************
*** 49,55 ****
  /* Describe layout of the address space in an executing process.  */
  
  #define TEXT_START      0x00400000
! #define DATA_START      0x10000000
  
  
  #if 0 /* These definitions were advantageous when not using
--- 49,55 ----
  /* Describe layout of the address space in an executing process.  */
  
  #define TEXT_START      0x00400000
! /* #define DATA_START      0x10000000 */
  
  
  #if 0 /* These definitions were advantageous when not using

Message #25 received at 2685-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Laurent GUERBY <laurent <at> guerby.net>
Cc: John Sullivan <johns <at> fsf.org>, 2685-done <at> debbugs.gnu.org
Subject: Re: Emergency (alloc): Warning: past 85% of memory limit
Date: Fri, 22 May 2009 14:46:56 -0400

> The problem is that Emacs is not determining the start of the data
> segment properly on MIPS machines.  In src/m/mips.h, we define
> DATA_START as 0x10000000

On further research, I think this is wrong for GNU/Linux.  It was
probably written for other operating systems in mind.  Undefining
DATA_START on GNU/Linux is pretty harmless; as I said, this causes Emacs
to fall back on another heuristic method for determining the start of
the data segment.  (Anyway, this change only affects this particular
platform).  So, I've checked in the change.

Message #30 received at 2685 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: John Sullivan <johns <at> fsf.org>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: Laurent GUERBY <laurent <at> guerby.net>, John Sullivan <johns <at> fsf.org>,
        2685 <at> debbugs.gnu.org
Subject: Re: Emergency (alloc): Warning: past 85% of memory limit
Date: Tue, 26 May 2009 23:06:31 -0400

Chong Yidong <cyd <at> stupidchicken.com> writes:

>> The problem is that Emacs is not determining the start of the data
>> segment properly on MIPS machines.  In src/m/mips.h, we define
>> DATA_START as 0x10000000
>
> On further research, I think this is wrong for GNU/Linux.  It was
> probably written for other operating systems in mind.  Undefining
> DATA_START on GNU/Linux is pretty harmless; as I said, this causes Emacs
> to fall back on another heuristic method for determining the start of
> the data segment.  (Anyway, this change only affects this particular
> platform).  So, I've checked in the change.
>

I just built the pretest and the error is gone. Thanks!

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