Differential D23233

[PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable
ClosedPublic
Actions

Authored by alfredo on Jan 17 2020, 2:03 PM.

Tags

Referenced Files

	Unknown Object (File)
	Tue, Sep 22, 9:19 PM

	Unknown Object (File)
	Sun, Sep 20, 10:29 AM

	Unknown Object (File)
	Sun, Sep 20, 6:40 AM

	Unknown Object (File)
	Sat, Sep 19, 9:53 PM

	Unknown Object (File)
	Sat, Sep 19, 9:41 PM

	Unknown Object (File)
	Sat, Sep 19, 9:17 PM

	Unknown Object (File)
	Fri, Sep 11, 9:28 AM

	Unknown Object (File)
	Sat, Sep 5, 11:38 AM

Subscribers

Details

Reviewers

jhibbits
bdragon
nwhitehorn

Commits

rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable

Summary

This fixes kernel crashing when tunable "machdep.moea64_bpvo_pool_size" is set to a value higher then 327680 (default value).
Function moea64_mid_bootstrap() relies on moea64_bpvo_pool_size, but at time of the use the variable wan't yet updated with the new value provided by user.

Problem was detected after trying to use a VM with 64GB of RAM, and default moea64_bpvo_pool_size is insufficient (kernel boot used more than 470000) .
I think default value must be discussed to address this use case, or find a way to calculate pool size automatically based on amount of memory detected.

Test Plan

Tested on QEMU VM with 64GB of RAM using "set machdep.moea64_bpvo_pool_size=655360" on loader prompt

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

alfredo created this revision.Jan 17 2020, 2:03 PM

Herald added a subscriber: luporl. · View Herald TranscriptJan 17 2020, 2:03 PM

Harbormaster completed remote builds in B28732: Diff 66909.Jan 17 2020, 2:03 PM

jhibbits added inline comments.Jan 17 2020, 5:27 PM

sys/powerpc/aim/mmu_oea64.c
917 ↗	(On Diff #66909)	Having this here, shouldn't you delete the TUNABLE_INT() above on line 188?

This revision was not accepted when it landed; it landed in state Needs Review.Jan 19 2020, 9:18 PM

Closed by commit rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable (authored by jhibbits). · Explain Why

This revision was automatically updated to reflect the committed changes.

jhibbits added a commit: rS356896: [PowerPC64] fix crash when using machdep.moea64_bpvo_pool_size tunable.

Herald added a subscriber: imp. · View Herald TranscriptJan 19 2020, 9:18 PM

Revision Contents
Changeset List

Path

Size

head/

sys/

powerpc/

aim/

10 lines

Diff 67028

head/sys/powerpc/aim/mmu_oea64.c

Loading...