linux-kernel - Re: [patch 03/20] x86, ptrace, bts: defer branch trace stopping

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Date:	Fri, 03 Apr 2009 17:00:52 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	markus.t.metzger@...el.com
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	markus.t.metzger@...il.com, roland@...hat.com,
	eranian@...glemail.com, oleg@...hat.com, juan.villacis@...el.com,
	ak@...ux.jf.intel.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 03/20] x86, ptrace, bts: defer branch trace stopping

On Fri, 2009-04-03 at 16:43 +0200, markus.t.metzger@...el.com wrote:
> Index: b/include/linux/mm.h
> ===================================================================
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -13,6 +13,7 @@
>  #include <linux/prio_tree.h>
>  #include <linux/debug_locks.h>
>  #include <linux/mm_types.h>
> +#include <linux/sched.h>

Why do we need that new include?

>  struct mempolicy;
>  struct anon_vma;
> @@ -1318,6 +1319,6 @@ void vmemmap_populate_print_last(void);
>  
>  extern void *alloc_locked_buffer(size_t size);
>  extern void free_locked_buffer(void *buffer, size_t size);
> -extern void release_locked_buffer(void *buffer, size_t size);
> +extern void refund_locked_buffer_memory(struct mm_struct *mm, size_t size);

that's a pointer to a struct, so it doesn't need a fully qualified type.

Also, I can't say I like the name, what about something like:

void account_locked_buffer(struct mm_struct *mm, long pages)
{
	down_write(&mm->mmap_sem);

	mm->total_vm += pages;
	mm->locked_vm += pages;

	up_write(&mm->mmap_sem);
}

but looking more closely at that alloc_locked_buffer() stuff, I really
hate it, who in his right mind does a multi-page kmalloc() -- that's
crazy.



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