Messages in this thread | | | Date | Sat, 20 Jul 2002 22:47:33 -0400 | From | Pete Zaitcev <> | Subject | Re: [PATCH] low-latency zap_page_range |
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> The lock hold time in zap_page_range is horrid. This patch breaks the > work up into chunks and relinquishes the lock after each iteration. > This drastically lowers latency by creating a preemption point, as well > as lowering lock contention.
> void zap_page_range(struct vm_area_struct *vma, unsigned long address, unsigned long size)
Arjan sent me something similar, done by AKPM, only he did this a little differently. He added an argument to zap_page_range which allowed to work it in the old way, if set. Then, he set it so all places would use low latency EXCEPT a reading from /dev/zero. I assume it was some locking somewhere in devices/char/mem.c, though I was unable to figure which in particular.
Andrew, care to unconfuse me?
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