zfs: use zero_region instead of allocating a dedicated page
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05621e0b20
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@ -113,7 +113,6 @@ static kstat_t *abd_ksp;
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* memory by only using a single zero buffer for the scatter chunks.
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*/
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abd_t *abd_zero_scatter = NULL;
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static char *abd_zero_buf = NULL;
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static uint_t
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abd_chunkcnt_for_bytes(size_t size)
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@ -241,18 +240,16 @@ abd_free_struct_impl(abd_t *abd)
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/*
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* Allocate scatter ABD of size SPA_MAXBLOCKSIZE, where
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* each chunk in the scatterlist will be set to abd_zero_buf.
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* each chunk in the scatterlist will be set to the same area.
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*/
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_Static_assert(ZERO_REGION_SIZE >= PAGE_SIZE, "zero_region too small");
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static void
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abd_alloc_zero_scatter(void)
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{
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uint_t i, n;
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n = abd_chunkcnt_for_bytes(SPA_MAXBLOCKSIZE);
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abd_zero_buf = kmem_cache_alloc(abd_chunk_cache, KM_PUSHPAGE);
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memset(abd_zero_buf, 0, PAGE_SIZE);
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abd_zero_scatter = abd_alloc_struct(SPA_MAXBLOCKSIZE);
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abd_zero_scatter->abd_flags |= ABD_FLAG_OWNER | ABD_FLAG_ZEROS;
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abd_zero_scatter->abd_size = SPA_MAXBLOCKSIZE;
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@ -260,7 +257,7 @@ abd_alloc_zero_scatter(void)
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for (i = 0; i < n; i++) {
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ABD_SCATTER(abd_zero_scatter).abd_chunks[i] =
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abd_zero_buf;
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__DECONST(void *, zero_region);
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}
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ABDSTAT_BUMP(abdstat_scatter_cnt);
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@ -275,7 +272,6 @@ abd_free_zero_scatter(void)
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abd_free_struct(abd_zero_scatter);
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abd_zero_scatter = NULL;
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kmem_cache_free(abd_chunk_cache, abd_zero_buf);
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}
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static int
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