Messages in this thread | | | From | Michael Buesch <> | Subject | pdflush -> noflushd related question | Date | Sat, 31 May 2003 18:41:59 +0200 |
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Hi.
I want to fix the userspace noflushd daemon to run on 2.5 kernels, but it seems to get *very* tricky, because bdflush, kupdated have been replaced by pdflush.
I've grepped through the lkml-archives and I found a post from you, Andrew, that sayed:
[SNIP] Subject: [patch] replace kupdate and bdflush with pdflush
- - use a timer to kick off a pdflush thread every five seconds to run the kupdate code.
- - wakeup_bdflush() kicks off a pdflush thread to run the current bdflush function.
There's some loss of functionality here - the ability to tune the writeback periods. The numbers are hardwired at present. But the intent is that buffer-based writeback disappears altogether. New mechanisms for tuning the writeback will need to be introduced. [SNIP]
Yea, but it seems, that I need exactly this lost functionality. :) noflushd, on 2.4 kernels, prevents the disks to spin up by spinning them down an stopping the kupdated daemon through putting the update-interval to 0 via syscall bdflush(). That's the code to do so: bdflush(2 + (1 << 3) + 1, interval);
So, how to set the interval, or better sayed, how to _stop_ buffer flushing in 2.5? Has this lost functionality already been re-implemented? Are there new syscalls?
Thanks for your help.
- -- Regards Michael Büsch http://www.8ung.at/tuxsoft 18:29:24 up 4:01, 2 users, load average: 1.11, 1.09, 1.05
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