Hi Jianpeng,
On 07/26/2013 03:08 PM, majianpeng wrote:
> Hi all,
> I used splice and found a prolem(at least i call).
> The demo is:
> A:splice(regularfileA--->pipe);
> B:splice(pipe--->regularfileB)
> Before do B, we modify the data of regA which now in pipe. The data to
> regularfileB willbe change.
> If we used the buff
> A:read(regA, buff);
> B: write(buff, regB);
> After A, the contend of regA can't effect the buff.
> Review the code of splice,I know the pipe share the pagecache of regA.
Right. And also this is the splice's original design intention, using share
mmap rather
than copy_to_user/copy_from_user in order to achieve zero-copy.
Thanks,
Gu
> Maybe this is not a problem or am i missing something?
>
> Thanks!
> Jianpeng
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