Re: Make pipe data structure be a circular list of pages, ratherthan

[Alan Cox]

On Gwe, 2005-01-07 at 14:30, Oleg Nesterov wrote:
> will block after writing PIPE_BUFFERS == 16 characters, no?
> And pipe_inode_info will use 64K to hold 16 bytes!
> 
> Is it ok?

That would break stuff, but holding the last page until it fills 4K
would work, or just basic sg coalescing when possible. The pipe
behaviour - particularly size and size of atomic writes is defined by
SuS and there are people who use pipes two ways between apps and use the
guarantees to avoid deadlocks

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