similar to: LFENCE instruction (was: [rfc][patch 3/3] x86: optimise barriers)

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

Nicholas Piggin <npiggin at gmail.com> writes: > Signed-off-by: Nicholas Piggin <npiggin at gmail.com> > --- > arch/powerpc/include/asm/paravirt.h | 28 ++++++++ > arch/powerpc/include/asm/qspinlock.h | 66 +++++++++++++++++++ > arch/powerpc/include/asm/qspinlock_paravirt.h | 7 ++ > arch/powerpc/platforms/pseries/Kconfig | 5 ++ >

Nicholas Piggin <npiggin at gmail.com> writes: > Signed-off-by: Nicholas Piggin <npiggin at gmail.com> > --- > arch/powerpc/include/asm/paravirt.h | 28 ++++++++ > arch/powerpc/include/asm/qspinlock.h | 66 +++++++++++++++++++ > arch/powerpc/include/asm/qspinlock_paravirt.h | 7 ++ > arch/powerpc/platforms/pseries/Kconfig | 5 ++ >

Nicholas Piggin <npiggin at gmail.com> writes: > These have shown significantly improved performance and fairness when > spinlock contention is moderate to high on very large systems. > > [ Numbers hopefully forthcoming after more testing, but initial > results look good ] Would be good to have something here, even if it's preliminary. > Thanks to the fast path,

This series adds an option to use queued spinlocks for powerpc, and makes it the default for the Book3S-64 subarch. This effort starts with the generic code so it's very simple but still very performant. There are optimisations that can be made to slowpaths, but I think it's better to attack those incrementally if/when we find things, and try to add the improvements to generic code as

v2 is updated to account for feedback from Will, Peter, and Waiman (thank you), and trims off a couple of RFC and unrelated patches. Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued

Updated with everybody's feedback (thanks all), and more performance results. What I've found is I might have been measuring the worst load point for the paravirt case, and by looking at a range of loads it's clear that queued spinlocks are overall better even on PV, doubly so when you look at the generally much improved worst case latencies. I have defaulted it to N even though

Hi: The following patch replaces a bash-specific substitution with equivalent POSIX /bin/sh substitutions. This allows a Xen-patched Linux to build when /bin/sh is a POSIX shell other than bash. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Thanks, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page:

This patch is ported one from 534:77db69c38249 of linux-2.6.18-xen.hg. Use wmb instead of rmb to enforce ordering between evtchn_upcall_pending and evtchn_pending_sel stores in xen_evtchn_do_upcall(). Cc: Samuel Thibault <samuel.thibault at eu.citrix.com> Signed-off-by: Isaku Yamahata <yamahata at valinux.co.jp> --- drivers/xen/events.c | 2 +- 1 files changed, 1 insertions(+), 1

Hi Keir: It has been brought to my attention that modular oprofile is broken because it now calls get_vm_area which is not an exported function. This appears to be the result of the changeset that removed vm_map_xen_pages which was only used by oprofile. So we either need to export get_vm_area in Xen, or put that function back. What do you think about this? Thanks, -- Visit Openswan at

addl clobbers flags (such as CF) but barrier.h didn't tell this to gcc. Historically, gcc doesn't need one on x86, and always considers flags clobbered. We are probably missing the cc clobber in a *lot* of places for this reason. But even if not necessary, it's probably a good thing to add for documentation, and in case gcc semantcs ever change. Reported-by: Borislav Petkov <bp at

On Tue, May 27, 2008 at 12:20:47PM +0100, Mark McLoughlin wrote: > hdr->csum_start is the offset from the start of the ethernet > header to the transport layer checksum field. skb->csum_start > is the offset from skb->head. > > skb_partial_csum_set() assumes that skb->data points to the > ethernet header - i.e. it computes skb->csum_start by adding > the

On Tue, May 27, 2008 at 12:20:47PM +0100, Mark McLoughlin wrote: > hdr->csum_start is the offset from the start of the ethernet > header to the transport layer checksum field. skb->csum_start > is the offset from skb->head. > > skb_partial_csum_set() assumes that skb->data points to the > ethernet header - i.e. it computes skb->csum_start by adding > the

Hi Keir: [PV-on-HVM]: Add missing includes This patch adds missing includes that currently work through indirect inclusions. This cannot be relied on and indeed does break on older kernels (2.4 for PV-on-HVM). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> diff -r 7953164cebb6 unmodified_drivers/linux-2.6/platform-pci/machine_reboot.c ---

Hi Keir: I spotted some bogus uses of the noreturn keyword on ia64. [IA64]: noreturn cannot be used if function may return The functions die_if_kernel and vmx_die_if_kernel can certainly return. This disqualifies them from using the noreturn keyword which is reserved for functions that never return. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Cheers, -- Visit Openswan at

Hi: The following patch replaces a bash-specific redirection in tools/ioemu/configure with a standard POSIX one which allows the Xen tools to be built with a POSIX shell other than bash. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au> Home Page:

Signed-off-by: Nick Piggin <npiggin@suse.de> -- Index: linux-2.6/fs/btrfs/compression.c =================================================================== --- linux-2.6.orig/fs/btrfs/compression.c +++ linux-2.6/fs/btrfs/compression.c @@ -478,7 +478,7 @@ static noinline int add_ra_bio_pages(str goto next; } - page = alloc_page(mapping_gfp_mask(mapping) | GFP_NOFS); + page =

Hi Keir: [NET] front: Fix features on resume when csum is off When the netfront driver is resumed the features are renegotiated with the backend. However, I forgot take into account the status of the TX checksum setting. When TX checksum is disabled by the user, we cannot enable SG or TSO since both require checksum offload. This patch makes xennet check the checksum setting before

On Thu, Oct 27, 2005 at 10:22:08PM -0700, H. Peter Anvin wrote: > > >So it looks like as long as dash can link with klibc then: OK, I've got it to build with klibc using klcc: $ size src/dash text data bss dec hex filename 63333 356 5940 69629 10ffd src/dash Unfortunately there seems to be something fishy in parameter expansion as it fails three