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Bug 51652

Summary: linux-2.4.7-page_table_races.patch summary
Product: [Retired] Red Hat Linux Reporter: Ben LaHaise <bcrl>
Component: kernelAssignee: Ben LaHaise <bcrl>
Status: CLOSED CURRENTRELEASE QA Contact: Brock Organ <borgan>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2001-08-13 16:15:11 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Ben LaHaise 2001-08-13 16:12:55 UTC 
This is just a quick explaination of the problems fixed by the page table
races patch.

1. use kmap_atomic in clear_user_*page
	- fixes potential schedule while holding page table spinlock
	under heavy load.
2. double spin_unlock fix in memory.c
	- code could spin_unlock twice under rare alignments while copying
	page tables
3. make map_user_kiobuf use read lock
	- prevents stalls during page faults waiting for io to complete
4. move page copy/clear out from page table spinlock
	- reduce spinlock contention