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virtio-mem: simplify MAX_ORDER - 1 / pageblock_order handling
Let's use pageblock_nr_pages and MAX_ORDER_NR_PAGES instead where possible to simplify. Add a comment why we have that restriction for now. Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com> 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> Link: https://lore.kernel.org/r/20201112133815.13332-4-david@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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20b9150225
1 changed files with 19 additions and 16 deletions
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@ -753,14 +753,15 @@ static void virtio_mem_clear_fake_offline(unsigned long pfn,
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*/
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static void virtio_mem_fake_online(unsigned long pfn, unsigned int nr_pages)
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{
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const int order = MAX_ORDER - 1;
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const unsigned long max_nr_pages = MAX_ORDER_NR_PAGES;
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int i;
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/*
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* We are always called with subblock granularity, which is at least
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* aligned to MAX_ORDER - 1.
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* We are always called at least with MAX_ORDER_NR_PAGES
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* granularity/alignment (e.g., the way subblocks work). All pages
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* inside such a block are alike.
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*/
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for (i = 0; i < nr_pages; i += 1 << order) {
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for (i = 0; i < nr_pages; i += max_nr_pages) {
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struct page *page = pfn_to_page(pfn + i);
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/*
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@ -770,14 +771,14 @@ static void virtio_mem_fake_online(unsigned long pfn, unsigned int nr_pages)
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* alike.
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*/
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if (PageDirty(page)) {
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virtio_mem_clear_fake_offline(pfn + i, 1 << order,
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virtio_mem_clear_fake_offline(pfn + i, max_nr_pages,
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false);
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generic_online_page(page, order);
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generic_online_page(page, MAX_ORDER - 1);
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} else {
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virtio_mem_clear_fake_offline(pfn + i, 1 << order,
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virtio_mem_clear_fake_offline(pfn + i, max_nr_pages,
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true);
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free_contig_range(pfn + i, 1 << order);
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adjust_managed_page_count(page, 1 << order);
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free_contig_range(pfn + i, max_nr_pages);
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adjust_managed_page_count(page, max_nr_pages);
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}
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}
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}
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@ -790,7 +791,7 @@ static void virtio_mem_online_page_cb(struct page *page, unsigned int order)
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int sb_id;
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/*
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* We exploit here that subblocks have at least MAX_ORDER - 1
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* We exploit here that subblocks have at least MAX_ORDER_NR_PAGES.
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* size/alignment and that this callback is is called with such a
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* size/alignment. So we cannot cross subblocks and therefore
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* also not memory blocks.
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@ -1673,13 +1674,15 @@ static int virtio_mem_init(struct virtio_mem *vm)
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"Some memory is not addressable. This can make some memory unusable.\n");
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/*
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* Calculate the subblock size:
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* - At least MAX_ORDER - 1 / pageblock_order.
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* - At least the device block size.
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* In the worst case, a single subblock per memory block.
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* We want subblocks to span at least MAX_ORDER_NR_PAGES and
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* pageblock_nr_pages pages. This:
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* - Simplifies our page onlining code (virtio_mem_online_page_cb)
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* and fake page onlining code (virtio_mem_fake_online).
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* - Is required for now for alloc_contig_range() to work reliably -
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* it doesn't properly handle smaller granularity on ZONE_NORMAL.
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*/
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vm->subblock_size = PAGE_SIZE * 1ul << max_t(uint32_t, MAX_ORDER - 1,
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pageblock_order);
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vm->subblock_size = max_t(uint64_t, MAX_ORDER_NR_PAGES,
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pageblock_nr_pages) * PAGE_SIZE;
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vm->subblock_size = max_t(uint64_t, vm->device_block_size,
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vm->subblock_size);
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vm->nb_sb_per_mb = memory_block_size_bytes() / vm->subblock_size;
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