linux-kernel - Re: [-mm][PATCH 4/4] Add memrlimit controller accounting and control (v4)

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Date:	Thu, 18 Sep 2008 13:54:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, skumar@...ux.vnet.ibm.com,
	yamamoto@...inux.co.jp, menage@...gle.com, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, xemul@...nvz.org,
	balbir@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [-mm][PATCH 4/4] Add memrlimit controller accounting and
 control (v4)

On Wed, 14 May 2008 18:39:51 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> This patch adds support for accounting and control of virtual address space
> limits.


Large changes in linux-next's arch/x86/kernel/ptrace.c caused damage to
the memrlimit patches.

I decided to retain the patches because it looks repairable.  The
problem is this reject from
memrlimit-add-memrlimit-controller-accounting-and-control.patch:

***************
*** 808,828 ****
  
  	current->mm->total_vm  -= old_size;
  	current->mm->locked_vm -= old_size;
  
  	if (size == 0)
  		goto out;
  
  	rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
  	vm = current->mm->total_vm  + size;
  	if (rlim < vm) {
  		ret = -ENOMEM;
  
  		if (!reduce_size)
- 			goto out;
  
  		size = rlim - current->mm->total_vm;
  		if (size <= 0)
- 			goto out;
  	}
  
  	rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
--- 809,833 ----
  
  	current->mm->total_vm  -= old_size;
  	current->mm->locked_vm -= old_size;
+ 	memrlimit_cgroup_uncharge_as(mm, old_size);
  
  	if (size == 0)
  		goto out;
  
+ 	if (memrlimit_cgroup_charge_as(current->mm, size))
+ 		goto out;
+ 
  	rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
  	vm = current->mm->total_vm  + size;
  	if (rlim < vm) {
  		ret = -ENOMEM;
  
  		if (!reduce_size)
+ 			goto out_uncharge;
  
  		size = rlim - current->mm->total_vm;
  		if (size <= 0)
+ 			goto out_uncharge;
  	}
  
  	rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
***************
*** 831,851 ****
  		ret = -ENOMEM;
  
  		if (!reduce_size)
- 			goto out;
  
  		size = rlim - current->mm->locked_vm;
  		if (size <= 0)
- 			goto out;
  	}
  
  	ret = ds_allocate((void **)&child->thread.ds_area_msr,
  			  size << PAGE_SHIFT);
  	if (ret < 0)
- 		goto out;
  
  	current->mm->total_vm  += size;
  	current->mm->locked_vm += size;
  
  out:
  	if (child->thread.ds_area_msr)
  		set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
--- 836,859 ----
  		ret = -ENOMEM;
  
  		if (!reduce_size)
+ 			goto out_uncharge;
  
  		size = rlim - current->mm->locked_vm;
  		if (size <= 0)
+ 			goto out_uncharge;
  	}
  
  	ret = ds_allocate((void **)&child->thread.ds_area_msr,
  			  size << PAGE_SHIFT);
  	if (ret < 0)
+ 		goto out_uncharge;
  
  	current->mm->total_vm  += size;
  	current->mm->locked_vm += size;
  
+ out_uncharge:
+ 	if (ret < 0)
+ 		memrlimit_cgroup_uncharge_as(mm, size);
  out:
  	if (child->thread.ds_area_msr)
  		set_tsk_thread_flag(child, TIF_DS_AREA_MSR);



could you plese take a look at today's mmotm and see what needs to be
done to salvage it?  Most of the code you were altering got moved into
arch/x86/kernel/ds.c and got changed rather a lot.


Thanks.
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