Bug 51652 - linux-2.4.7-page_table_races.patch summary
linux-2.4.7-page_table_races.patch summary
Status: CLOSED CURRENTRELEASE
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.3
i386 Linux
medium Severity medium
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Assigned To: Ben LaHaise
Brock Organ
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Depends On:
Blocks:
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Reported: 2001-08-13 12:12 EDT by Ben LaHaise
Modified: 2007-04-18 12:35 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-08-13 12:15:11 EDT
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Description Ben LaHaise 2001-08-13 12:12:55 EDT
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

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