RE: [patch 03/20] x86, ptrace, bts: defer branch trace stopping

[Metzger, Markus T]

>-----Original Message-----
>From: Peter Zijlstra [mailto:a.p.zijlstra@xxxxxxxxx]
>Sent: Friday, April 03, 2009 5:01 PM
>To: Metzger, Markus T


>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.

I need a non-pageable chunk of memory to give to the cpu to store branch
trace data in. Kmalloc() is easy to use and gives me what I need.

How would I do this correctly?

thanks,
markus.
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