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linux-datastuctures-2.md:correct some descriptions

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GFP_NOIO: "NOIO" is the point rather than "can't sleep"
__GFP_HIGHMEM: allocation can happens at either ZONE_NORMAL or ZONE_HIGHMEM
GFP_ATOMIC: allocation don't have to be in a "process"(e.g. in an interupt handler)

Signed-off-by: qinyu <chinyu0704@outlook.com>
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qinyu 2020-11-26 19:35:18 +08:00
parent e48b51440a
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DataStructures/linux-datastructures-2.md
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@ -61,11 +61,11 @@ This structure presents the root of a radix tree and contains three fields:
The first field we will discuss is `gfp_mask`: The first field we will discuss is `gfp_mask`:
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. 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.
* `GFP_NOIO` - can sleep and wait for memory; * `GFP_NOIO` - allcation can block but must not initiate disk I/O;
* `__GFP_HIGHMEM` - high memory can be used; * `__GFP_HIGHMEM` - either ZONE_HIGHMEM or ZONE_NORMAL can be used;
* `GFP_ATOMIC` - allocation process is high-priority and can't sleep; * `GFP_ATOMIC` - allocation process is high-priority and must not sleep;
etc. etc.