From: Liang Li <liang.z.li@intel.com> To: qemu-devel@nongnu.org Cc: mst@redhat.com, pbonzini@redhat.com, quintela@redhat.com, amit.shah@redhat.com, kvm@vger.kernel.org, dgilbert@redhat.com, thuth@redhat.com, virtio-dev@lists.oasis-open.org, dave.hansen@intel.com, Liang Li <liang.z.li@intel.com> Subject: [PATCH qemu v3 4/6] bitmap: Add a new bitmap_move function Date: Fri, 21 Oct 2016 14:48:22 +0800 [thread overview] Message-ID: <1477032504-12745-5-git-send-email-liang.z.li@intel.com> (raw) In-Reply-To: <1477032504-12745-1-git-send-email-liang.z.li@intel.com> 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> --- include/qemu/bitmap.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 63ea2d0..775d05e 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 */ @@ -129,6 +130,18 @@ 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) { -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Liang Li <liang.z.li@intel.com> To: qemu-devel@nongnu.org Cc: mst@redhat.com, pbonzini@redhat.com, quintela@redhat.com, amit.shah@redhat.com, kvm@vger.kernel.org, dgilbert@redhat.com, thuth@redhat.com, virtio-dev@lists.oasis-open.org, dave.hansen@intel.com, Liang Li <liang.z.li@intel.com> Subject: [Qemu-devel] [PATCH qemu v3 4/6] bitmap: Add a new bitmap_move function Date: Fri, 21 Oct 2016 14:48:22 +0800 [thread overview] Message-ID: <1477032504-12745-5-git-send-email-liang.z.li@intel.com> (raw) In-Reply-To: <1477032504-12745-1-git-send-email-liang.z.li@intel.com> 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> --- include/qemu/bitmap.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 63ea2d0..775d05e 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 */ @@ -129,6 +130,18 @@ 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) { -- 1.8.3.1
next prev parent reply other threads:[~2016-10-21 6:48 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-10-21 6:48 [PATCH qemu v3 0/6] Fast (de)inflating & fast live migration Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 6:48 ` [PATCH qemu v3 1/6] virtio-balloon: update linux head file Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 6:48 ` [PATCH qemu v3 2/6] virtio-balloon: speed up inflating & deflating process Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 6:48 ` [PATCH qemu v3 3/6] balloon: get free page info from guest Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 6:48 ` Liang Li [this message] 2016-10-21 6:48 ` [Qemu-devel] [PATCH qemu v3 4/6] bitmap: Add a new bitmap_move function Liang Li 2016-10-21 6:48 ` [PATCH qemu v3 5/6] kvm: Add two new arch specific functions Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 6:48 ` [PATCH qemu v3 6/6] migration: skip free pages during live migration Liang Li 2016-10-21 6:48 ` [Qemu-devel] " Liang Li 2016-10-21 7:19 ` [Qemu-devel] [PATCH qemu v3 0/6] Fast (de)inflating & fast " no-reply 2016-10-21 7:19 ` no-reply 2016-10-21 7:22 ` no-reply 2016-10-21 7:22 ` no-reply 2016-10-30 22:05 ` Michael S. Tsirkin 2016-10-30 22:05 ` [Qemu-devel] " Michael S. Tsirkin
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