From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> To: Liang Li <liang.z.li@intel.com> Cc: qemu-devel@nongnu.org, mst@redhat.com, pbonzini@redhat.com, quintela@redhat.com, amit.shah@redhat.com, kvm@vger.kernel.org, thuth@redhat.com Subject: Re: [QEMU v2 7/9] bitmap: Add a new bitmap_move function Date: Mon, 1 Aug 2016 12:25:37 +0100 [thread overview] Message-ID: <20160801112536.GB3858@work-vm> (raw) In-Reply-To: <1468550849-22172-8-git-send-email-liang.z.li@intel.com> * Liang Li (liang.z.li@intel.com) wrote: > Sometimes, it is need to move a portion of bitmap to another place > in a large bitmap, if overlap happens, the bitmap_copy can't not > work correctly, we need a new function to do this work. > > Signed-off-by: Liang Li <liang.z.li@intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > --- > include/qemu/bitmap.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h > index ec5146f..6ac89ca 100644 > --- a/include/qemu/bitmap.h > +++ b/include/qemu/bitmap.h > @@ -37,6 +37,7 @@ > * bitmap_set(dst, pos, nbits) Set specified bit area > * bitmap_set_atomic(dst, pos, nbits) Set specified bit area with atomic ops > * bitmap_clear(dst, pos, nbits) Clear specified bit area > + * bitmap_move(dst, src, nbits) Move *src to *dst > * bitmap_test_and_clear_atomic(dst, pos, nbits) Test and clear area > * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area > */ > @@ -136,6 +137,18 @@ static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, > } > } > > +static inline void bitmap_move(unsigned long *dst, const unsigned long *src, > + long nbits) > +{ > + if (small_nbits(nbits)) { > + unsigned long tmp = *src; > + *dst = tmp; > + } else { > + long len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); > + memmove(dst, src, len); > + } > +} > + > static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, > const unsigned long *src2, long nbits) > { > -- > 1.9.1 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
WARNING: multiple messages have this Message-ID (diff)
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> To: Liang Li <liang.z.li@intel.com> Cc: qemu-devel@nongnu.org, mst@redhat.com, pbonzini@redhat.com, quintela@redhat.com, amit.shah@redhat.com, kvm@vger.kernel.org, thuth@redhat.com Subject: Re: [Qemu-devel] [QEMU v2 7/9] bitmap: Add a new bitmap_move function Date: Mon, 1 Aug 2016 12:25:37 +0100 [thread overview] Message-ID: <20160801112536.GB3858@work-vm> (raw) In-Reply-To: <1468550849-22172-8-git-send-email-liang.z.li@intel.com> * Liang Li (liang.z.li@intel.com) wrote: > Sometimes, it is need to move a portion of bitmap to another place > in a large bitmap, if overlap happens, the bitmap_copy can't not > work correctly, we need a new function to do this work. > > Signed-off-by: Liang Li <liang.z.li@intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > --- > include/qemu/bitmap.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h > index ec5146f..6ac89ca 100644 > --- a/include/qemu/bitmap.h > +++ b/include/qemu/bitmap.h > @@ -37,6 +37,7 @@ > * bitmap_set(dst, pos, nbits) Set specified bit area > * bitmap_set_atomic(dst, pos, nbits) Set specified bit area with atomic ops > * bitmap_clear(dst, pos, nbits) Clear specified bit area > + * bitmap_move(dst, src, nbits) Move *src to *dst > * bitmap_test_and_clear_atomic(dst, pos, nbits) Test and clear area > * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area > */ > @@ -136,6 +137,18 @@ static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, > } > } > > +static inline void bitmap_move(unsigned long *dst, const unsigned long *src, > + long nbits) > +{ > + if (small_nbits(nbits)) { > + unsigned long tmp = *src; > + *dst = tmp; > + } else { > + long len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); > + memmove(dst, src, len); > + } > +} > + > static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, > const unsigned long *src2, long nbits) > { > -- > 1.9.1 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2016-08-01 11:25 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-15 2:47 [QEMU v2 0/9] Fast (de)inflating & fast live migration Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 1/9] virtio-balloon: Remove needless precompiled directive Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-08-01 10:42 ` Dr. David Alan Gilbert 2016-08-01 10:42 ` [Qemu-devel] " Dr. David Alan Gilbert 2016-08-01 23:48 ` Li, Liang Z 2016-08-01 23:48 ` [Qemu-devel] " Li, Liang Z 2016-07-15 2:47 ` [QEMU v2 2/9] virtio-balloon: update linux head file Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 3/9] virtio-balloon: speed up inflating & deflating process Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 4/9] virtio-balloon: update linux head file for new feature Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 5/9] balloon: get free page info from guest Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 6/9] balloon: migrate vq elem to destination Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 7/9] bitmap: Add a new bitmap_move function Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-08-01 11:25 ` Dr. David Alan Gilbert [this message] 2016-08-01 11:25 ` Dr. David Alan Gilbert 2016-07-15 2:47 ` [QEMU v2 8/9] kvm: Add two new arch specific functions Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-15 2:47 ` [QEMU v2 9/9] migration: skip free pages during live migration Liang Li 2016-07-15 2:47 ` [Qemu-devel] " Liang Li 2016-07-21 8:10 ` [QEMU v2 0/9] Fast (de)inflating & fast " Li, Liang Z 2016-07-21 8:10 ` [Qemu-devel] " Li, Liang Z
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