Re: [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch

Zachary Amsden wrote:
> In shadow mode hypervisors, ptep_get_and_clear achieves the desired
> purpose of keeping the shadows in sync by issuing a native_get_and_clear,
> followed by a call to pte_update, which indicates the PTE has been
> modified.
>
> Direct mode hypervisors (Xen) have no need for this anyway, and will trap
> the update using writable pagetables.
>   

Jan Beulich just posted a patch for Xen/linux which specialzes
ptep_get_and_clear, which apparently improves kernel-compile performance
by 25-30% on some configurations.  I think we'll want to keep this.

    J
-
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/

---

• Follow-Ups:
  • Re: [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch
    • From: Zachary Amsden <[email protected]>

• References:
  • [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch
    • From: Zachary Amsden <[email protected]>

• Prev by Date: Re: [PATCH] Show slab memory usage on OOM and SysRq-M
• Next by Date: Re: so what *is* obsolete and removable?
• Previous by thread: Re: [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch
• Next by thread: Re: [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch
• 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]