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Date: Tue, 15 Apr 2008 17:35:34 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Markus Metzger <markus.t.metzger@intel.com>
Cc: andi-suse@firstfloor.org, hpa@zytor.com, linux-kernel@vger.kernel.org,
       mingo@elte.hu, tglx@linutronix.de, markus.t.metzger@intel.com,
       markus.t.metzger@gmail.com, suresh.b.siddha@intel.com,
       roland@redhat.com, mtk.manpages@gmail.com, eranian@googlemail.com,
       juan.villacis@intel.com
Subject: Re: [patch 1/1] x86, ptrace: PEBS support
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On Tue, 8 Apr 2008 11:01:58 +0200
Markus Metzger <markus.t.metzger@intel.com> wrote:

> +static inline void *ds_allocate_buffer(size_t size, unsigned int *pages)
>  {
> -	(*(unsigned long *)(base + ds_cfg.bts_interrupt_threshold.offset)) = value;
> +	unsigned long rlim, vm, pgsz;
> +	void *buffer;
> +
> +	pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
> +
> +	rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
> +	vm   = current->mm->total_vm  + pgsz;
> +	if (rlim < vm)
> +		return 0;
> +
> +	rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
> +	vm   = current->mm->locked_vm  + pgsz;
> +	if (rlim < vm)
> +		return 0;

Should we skip the RLIMIT_MEMLOCK check if capable(CAP_IPC_LOCK)?

It's a fairly large patch.