From: David Hildenbrand <david@redhat.com> To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Andrew Morton <akpm@linux-foundation.org>, "Michael S . Tsirkin" <mst@redhat.com>, David Hildenbrand <david@redhat.com>, Jason Wang <jasowang@redhat.com>, Pankaj Gupta <pankaj.gupta.linux@gmail.com> Subject: [PATCH v1 18/29] virtio-mem: factor out calculation of the bit number within the sb_states bitmap Date: Mon, 12 Oct 2020 14:53:12 +0200 [thread overview] Message-ID: <20201012125323.17509-19-david@redhat.com> (raw) In-Reply-To: <20201012125323.17509-1-david@redhat.com> The calculation is already complicated enough, let's limit it to one location. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: David Hildenbrand <david@redhat.com> --- drivers/virtio/virtio_mem.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 2cc497ad8298..73ff6e9ba839 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -327,6 +327,16 @@ static int virtio_mem_sbm_mb_states_prepare_next_mb(struct virtio_mem *vm) _mb_id--) \ if (virtio_mem_sbm_get_mb_state(_vm, _mb_id) == _state) +/* + * Calculate the bit number in the sb_states bitmap for the given subblock + * inside the given memory block. + */ +static int virtio_mem_sbm_sb_state_bit_nr(struct virtio_mem *vm, + unsigned long mb_id, int sb_id) +{ + return (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; +} + /* * Mark all selected subblocks plugged. * @@ -336,7 +346,7 @@ static void virtio_mem_sbm_set_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); __bitmap_set(vm->sbm.sb_states, bit, count); } @@ -350,7 +360,7 @@ static void virtio_mem_sbm_set_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); __bitmap_clear(vm->sbm.sb_states, bit, count); } @@ -362,7 +372,7 @@ static bool virtio_mem_sbm_test_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); if (count == 1) return test_bit(bit, vm->sbm.sb_states); @@ -379,7 +389,7 @@ static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); /* TODO: Helper similar to bitmap_set() */ return find_next_bit(vm->sbm.sb_states, bit + count, bit) >= @@ -393,7 +403,7 @@ static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm, static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm, unsigned long mb_id) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, 0); return find_next_zero_bit(vm->sbm.sb_states, bit + vm->nb_sb_per_mb, bit) - bit; -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com> To: linux-kernel@vger.kernel.org Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>, "Michael S . Tsirkin" <mst@redhat.com>, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org> Subject: [PATCH v1 18/29] virtio-mem: factor out calculation of the bit number within the sb_states bitmap Date: Mon, 12 Oct 2020 14:53:12 +0200 [thread overview] Message-ID: <20201012125323.17509-19-david@redhat.com> (raw) In-Reply-To: <20201012125323.17509-1-david@redhat.com> The calculation is already complicated enough, let's limit it to one location. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: David Hildenbrand <david@redhat.com> --- drivers/virtio/virtio_mem.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 2cc497ad8298..73ff6e9ba839 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -327,6 +327,16 @@ static int virtio_mem_sbm_mb_states_prepare_next_mb(struct virtio_mem *vm) _mb_id--) \ if (virtio_mem_sbm_get_mb_state(_vm, _mb_id) == _state) +/* + * Calculate the bit number in the sb_states bitmap for the given subblock + * inside the given memory block. + */ +static int virtio_mem_sbm_sb_state_bit_nr(struct virtio_mem *vm, + unsigned long mb_id, int sb_id) +{ + return (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; +} + /* * Mark all selected subblocks plugged. * @@ -336,7 +346,7 @@ static void virtio_mem_sbm_set_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); __bitmap_set(vm->sbm.sb_states, bit, count); } @@ -350,7 +360,7 @@ static void virtio_mem_sbm_set_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); __bitmap_clear(vm->sbm.sb_states, bit, count); } @@ -362,7 +372,7 @@ static bool virtio_mem_sbm_test_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); if (count == 1) return test_bit(bit, vm->sbm.sb_states); @@ -379,7 +389,7 @@ static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); /* TODO: Helper similar to bitmap_set() */ return find_next_bit(vm->sbm.sb_states, bit + count, bit) >= @@ -393,7 +403,7 @@ static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm, static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm, unsigned long mb_id) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb; + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, 0); return find_next_zero_bit(vm->sbm.sb_states, bit + vm->nb_sb_per_mb, bit) - bit; -- 2.26.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2020-10-12 12:56 UTC|newest] Thread overview: 175+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-12 12:52 [PATCH v1 00/29] virtio-mem: Big Block Mode (BBM) David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-12 12:52 ` [PATCH v1 01/29] virtio-mem: determine nid only once using memory_add_physaddr_to_nid() David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-15 3:56 ` Wei Yang 2020-10-15 19:26 ` Pankaj Gupta 2020-10-15 19:26 ` Pankaj Gupta 2020-10-12 12:52 ` [PATCH v1 02/29] virtio-mem: simplify calculation in virtio_mem_mb_state_prepare_next_mb() David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-15 4:02 ` Wei Yang 2020-10-15 8:00 ` David Hildenbrand 2020-10-15 8:00 ` David Hildenbrand 2020-10-15 10:00 ` Wei Yang 2020-10-15 10:01 ` David Hildenbrand 2020-10-15 10:01 ` David Hildenbrand 2020-10-15 20:24 ` Pankaj Gupta 2020-10-15 20:24 ` Pankaj Gupta 2020-10-16 9:00 ` David Hildenbrand 2020-10-16 9:00 ` David Hildenbrand 2020-10-12 12:52 ` [PATCH v1 03/29] virtio-mem: simplify MAX_ORDER - 1 / pageblock_order handling David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-15 7:06 ` Wei Yang 2020-10-12 12:52 ` [PATCH v1 04/29] virtio-mem: drop rc2 in virtio_mem_mb_plug_and_add() David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-12 13:09 ` Pankaj Gupta 2020-10-12 13:09 ` Pankaj Gupta 2020-10-15 7:14 ` Wei Yang 2020-10-12 12:52 ` [PATCH v1 05/29] virtio-mem: generalize check for added memory David Hildenbrand 2020-10-12 12:52 ` David Hildenbrand 2020-10-15 8:28 ` Wei Yang 2020-10-15 8:50 ` David Hildenbrand 2020-10-15 8:50 ` David Hildenbrand 2020-10-16 2:16 ` Wei Yang 2020-10-16 9:11 ` David Hildenbrand 2020-10-16 9:11 ` David Hildenbrand 2020-10-16 10:02 ` Wei Yang 2020-10-16 10:32 ` David Hildenbrand 2020-10-16 10:32 ` David Hildenbrand 2020-10-16 22:38 ` Wei Yang 2020-10-17 7:39 ` David Hildenbrand 2020-10-17 7:39 ` David Hildenbrand 2020-10-18 12:27 ` Wei Yang 2020-10-16 22:39 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 06/29] virtio-mem: generalize virtio_mem_owned_mb() David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-15 8:32 ` Wei Yang 2020-10-15 8:37 ` David Hildenbrand 2020-10-15 8:37 ` David Hildenbrand 2020-10-15 20:30 ` Pankaj Gupta 2020-10-15 20:30 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 07/29] virtio-mem: generalize virtio_mem_overlaps_range() David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-20 9:22 ` Pankaj Gupta 2020-10-20 9:22 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 08/29] virtio-mem: drop last_mb_id David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-15 8:35 ` Wei Yang 2020-10-15 20:32 ` Pankaj Gupta 2020-10-15 20:32 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 09/29] virtio-mem: don't always trigger the workqueue when offlining memory David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 4:03 ` Wei Yang 2020-10-16 9:18 ` David Hildenbrand 2020-10-16 9:18 ` David Hildenbrand 2020-10-18 3:57 ` Wei Yang 2020-10-19 9:04 ` David Hildenbrand 2020-10-19 9:04 ` David Hildenbrand 2020-10-20 0:41 ` Wei Yang 2020-10-20 9:09 ` David Hildenbrand 2020-10-20 9:09 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 10/29] virtio-mem: generalize handling when memory is getting onlined deferred David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 11/29] virtio-mem: use "unsigned long" for nr_pages when fake onlining/offlining David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-15 20:31 ` Pankaj Gupta 2020-10-15 20:31 ` Pankaj Gupta 2020-10-16 6:11 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 12/29] virtio-mem: factor out fake-offlining into virtio_mem_fake_offline() David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 6:24 ` Wei Yang 2020-10-20 9:31 ` Pankaj Gupta 2020-10-20 9:31 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 13/29] virtio-mem: factor out handling of fake-offline pages in memory notifier David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 7:15 ` Wei Yang 2020-10-16 8:00 ` Wei Yang 2020-10-16 8:57 ` David Hildenbrand 2020-10-16 8:57 ` David Hildenbrand 2020-10-18 12:37 ` Wei Yang 2020-10-18 12:38 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 14/29] virtio-mem: retry fake-offlining via alloc_contig_range() on ZONE_MOVABLE David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 15/29] virito-mem: document Sub Block Mode (SBM) David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-15 9:33 ` David Hildenbrand 2020-10-15 9:33 ` David Hildenbrand 2020-10-20 9:38 ` Pankaj Gupta 2020-10-20 9:38 ` Pankaj Gupta 2020-10-16 8:03 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 16/29] virtio-mem: memory block states are specific to " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:40 ` Wei Yang 2020-10-16 8:43 ` Wei Yang 2020-10-20 9:48 ` Pankaj Gupta 2020-10-20 9:48 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 17/29] virito-mem: subblock " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:43 ` Wei Yang 2020-10-20 9:54 ` Pankaj Gupta 2020-10-20 9:54 ` Pankaj Gupta 2020-10-12 12:53 ` David Hildenbrand [this message] 2020-10-12 12:53 ` [PATCH v1 18/29] virtio-mem: factor out calculation of the bit number within the sb_states bitmap David Hildenbrand 2020-10-16 8:46 ` Wei Yang 2020-10-20 9:58 ` Pankaj Gupta 2020-10-20 9:58 ` Pankaj Gupta 2020-10-12 12:53 ` [PATCH v1 19/29] virito-mem: existing (un)plug functions are specific to Sub Block Mode (SBM) David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:49 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 20/29] virtio-mem: nb_sb_per_mb and subblock_size " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:51 ` Wei Yang 2020-10-16 8:53 ` Wei Yang 2020-10-16 13:17 ` David Hildenbrand 2020-10-16 13:17 ` David Hildenbrand 2020-10-18 12:41 ` Wei Yang 2020-10-19 11:57 ` David Hildenbrand 2020-10-19 11:57 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 21/29] virtio-mem: memory notifier callbacks " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-19 1:57 ` Wei Yang 2020-10-19 10:22 ` David Hildenbrand 2020-10-19 10:22 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 22/29] virtio-mem: memory block ids " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:54 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 23/29] virtio-mem: factor out adding/removing memory from Linux David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 8:59 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 24/29] virtio-mem: print debug messages from virtio_mem_send_*_request() David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 9:07 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 25/29] virtio-mem: Big Block Mode (BBM) memory hotplug David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-16 9:38 ` Wei Yang 2020-10-16 13:13 ` David Hildenbrand 2020-10-16 13:13 ` David Hildenbrand 2020-10-19 2:26 ` Wei Yang 2020-10-19 9:15 ` David Hildenbrand 2020-10-19 9:15 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 26/29] virtio-mem: allow to force Big Block Mode (BBM) and set the big block size David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 27/29] mm/memory_hotplug: extend offline_and_remove_memory() to handle more than one memory block David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-15 13:08 ` Michael S. Tsirkin 2020-10-15 13:08 ` Michael S. Tsirkin 2020-10-19 3:22 ` Wei Yang 2020-10-12 12:53 ` [PATCH v1 28/29] virtio-mem: Big Block Mode (BBM) - basic memory hotunplug David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-19 3:48 ` Wei Yang 2020-10-19 9:12 ` David Hildenbrand 2020-10-19 9:12 ` David Hildenbrand 2020-10-12 12:53 ` [PATCH v1 29/29] virtio-mem: Big Block Mode (BBM) - safe " David Hildenbrand 2020-10-12 12:53 ` David Hildenbrand 2020-10-19 7:54 ` Wei Yang 2020-10-19 8:50 ` David Hildenbrand 2020-10-19 8:50 ` David Hildenbrand 2020-10-20 0:23 ` Wei Yang 2020-10-20 0:24 ` Wei Yang 2020-10-18 12:49 ` [PATCH v1 00/29] virtio-mem: Big Block Mode (BBM) Wei Yang 2020-10-18 16:35 ` David Hildenbrand 2020-10-18 16:35 ` David Hildenbrand 2020-10-18 15:29 ` Michael S. Tsirkin 2020-10-18 15:29 ` Michael S. Tsirkin 2020-10-18 16:34 ` David Hildenbrand 2020-10-18 16:34 ` David Hildenbrand
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