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dm writecache: add unlikely for getting two block with same LBA
In function writecache_writeback, entries g and f has same original sector only happens at entry f has been committed, but entry g has NOT yet. The probability of this happening is very low in the following 256 blocks at most of entry e. Signed-off-by: Huaisheng Ye <yehs1@lenovo.com> Acked-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -1628,8 +1628,8 @@ restart:
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if (unlikely(!next_node))
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break;
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g = container_of(next_node, struct wc_entry, rb_node);
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if (read_original_sector(wc, g) ==
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read_original_sector(wc, f)) {
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if (unlikely(read_original_sector(wc, g) ==
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read_original_sector(wc, f))) {
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f = g;
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continue;
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}
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