Index of /pub/linux/kernel.org/kernel/people/rml/vm/low-latency-zap_page_range

Icon  Name                                        Last modified      Size  Description
[PARENTDIR] Parent Directory                                                 -   
[TXT] README                                      2002-07-24 06:11  498   
[   ] sha256sums.asc                              2023-04-26 06:12  958   
[DIR] v2.4/                                       2013-01-26 00:42    -   
[DIR] v2.5/                                       2013-01-26 00:42    -   

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. 

The chunk size is ZAP_BLOCK_SIZE and currently 256*PAGE_SIZE. 

This lowers the maximum latency in zap_page_range from 10~20ms (on a
dual Athlon - one of the worst latencies recorded) to unmeasurable.

The patch contains some other cleanups too.

	-- rml