Differential D20066

Stop checking for TD_IDLETHREAD() in the buffer cache.
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Authored by markj on Apr 26 2019, 6:15 AM.

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	F106184624: D20066.id56686.diff
	Thu, Dec 26, 7:16 PM

	F106181787: D20066.id56693.diff
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	F106181063: D20066.id56805.diff
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imp

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kib
mckusick

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rS346888: Stop checking TD_IDLETHREAD() in buffer cache routines.

Summary

The checks seems to be vestigal; an idle thread cannot execute these
code paths. For example, an idle thread is not permitted to acquire
locks.

Cache curthread in bread(). No functional change intended.

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Repository

rS FreeBSD src repository - subversion

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Unit

Tests Not Applicable

Event Timeline

markj created this revision.Apr 26 2019, 6:15 AM

Harbormaster completed remote builds in B23915: Diff 56686.Apr 26 2019, 6:15 AM

markj added reviewers: kib, mckusick.Apr 26 2019, 7:27 AM

Wouldn't the same argument apply to the getblkx() use of the predicate ?

In D20066#431505, @kib wrote:

Wouldn't the same argument apply to the getblkx() use of the predicate ?

Indeed, I missed that one somehow.

Remove another always-false check.

Harbormaster completed remote builds in B23920: Diff 56693.Apr 26 2019, 7:40 AM

kib accepted this revision.Apr 26 2019, 7:51 AM

This revision is now accepted and ready to land.Apr 26 2019, 7:51 AM

A useful cleanup.

Closed by commit rS346888: Stop checking TD_IDLETHREAD() in buffer cache routines. (authored by markj). · Explain WhyApr 29 2019, 1:23 PM

This revision was automatically updated to reflect the committed changes.

Herald added a subscriber: imp. · View Herald TranscriptApr 29 2019, 1:23 PM

Revision Contents
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Path

Size

head/

sys/

kern/

vfs_bio.c

48 lines

Diff 56805

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Stop checking for TD_IDLETHREAD() in the buffer cache.ClosedPublicActions