* Evgeniy Polyakov <[email protected]> wrote:
> [...] it still has a problem - syscall blocks and the same thread thus
> is not allowed to continue execution and fill the pipe - so what if
> system issues thousands of requests and there are only tens of working
> thread at most. [...]
the same thread is allowed to continue execution even if the system call
blocks: take a look at async_schedule(). The blocked system-call is 'put
aside' (in a sleeping thread), the kernel switches the user-space
context (registers) to a free kernel thread and switches to it - and
returns to user-space as if nothing happened - allowing the user-space
context to 'fill the pipe' as much as it can. Or did i misunderstand
your point?
basically there's SYSLET_ASYNC for 'always async' and SYSLET_SYNC for
'always sync' - but the default syslet behavior is: 'try sync and switch
transparently to async on demand'. The testcode i sent very much uses
this. (and this mechanism is in essence Zach's fibril-switching thing,
but done via kernel threads.)
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
