Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()

On Sat, 2006-06-24 at 12:21 -0700, Linus Torvalds wrote:
> 
> On Sat, 24 Jun 2006, Arjan van de Ven wrote:
> > 
> > while this patch will reduce the number of cycles spent in the kernel,
> > it's just pushing the cache miss to userspace (by virtue of doing a
> > cache flush effectively)... is this really the right thing? The total
> > memory bandwidth will actually increase with this patch if you're
> > unlucky (eg if userspace decides to write to this memory eventually)....
> 
> No. It's for copying _from_ user space, ie a "write()" system call.

eh DOH

never mind



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• References:
  • Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()
    • From: Linus Torvalds <[email protected]>

• Prev by Date: Re: Measuring tools - top and interrupts
• Next by Date: Re: [Openipmi-developer] BUG: soft lockup detected on CPU#1, ipmi_si
• Previous by thread: Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()
• Next by thread: Re: [PATCH] x86: cache pollution aware __copy_from_user_ll()
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]