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@@ -61,11 +61,11 @@ This structure presents the root of a radix tree and contains three fields:
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The first field we will discuss is `gfp_mask`:
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-Low-level kernel memory allocation functions take a set of flags as - `gfp_mask`, which describes how that allocation is to be performed. These `GFP_` flags which control the allocation process can have following values: (`GFP_NOIO` flag) means sleep and wait for memory, (`__GFP_HIGHMEM` flag) means high memory can be used, (`GFP_ATOMIC` flag) means the allocation process has high-priority and can't sleep etc.
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+Low-level kernel memory allocation functions take a set of flags as - `gfp_mask`, which describes how that allocation is to be performed. These `GFP_` flags which control the allocation process can have following values: (`GFP_NOIO` flag) means allocation can block but must not initiate disk I/O; (`__GFP_HIGHMEM` flag) means either ZONE_HIGHMEM or ZONE_NORMAL memory can be used; (`GFP_ATOMIC` flag) means the allocation is high-priority and must not sleep, etc.
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-* `GFP_NOIO` - can sleep and wait for memory;
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-* `__GFP_HIGHMEM` - high memory can be used;
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-* `GFP_ATOMIC` - allocation process is high-priority and can't sleep;
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+* `GFP_NOIO` - allcation can block but must not initiate disk I/O;
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+* `__GFP_HIGHMEM` - either ZONE_HIGHMEM or ZONE_NORMAL can be used;
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+* `GFP_ATOMIC` - allocation process is high-priority and must not sleep;
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etc.
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