Diffusion FreeBSD src repository 231d75568f16

Move INVLPG to pmap_quick_enter_page() from pmap_quick_remove_page().
231d75568f16
Actions

Tags

None

Referenced Files

None

Subscribers

None

Description

Move INVLPG to pmap_quick_enter_page() from pmap_quick_remove_page().

If processor prefetches neighboring TLB entries to the one being accessed
(as some have been reported to do), then the spin lock does not prevent
the situation described in the "AMD64 Architecture Programmer's Manual
Volume 2: System Programming" rev. 3.23, "7.3.1 Special Coherency
Considerations".

Reported and reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D37770

Details

Provenance

kib	Authored on Dec 29 2022, 8:48 PM

Differential Revision

D37770: amd64: for small cores, use (big hammer) INVPCID_CTXGLOB instead of INVLPG

Parents

rGcde70e312c3f: amd64: for small cores, use (big hammer) INVPCID_CTXGLOB instead of INVLPG

Branches

Unknown

Tags

Unknown

Event Timeline

kib committed rG231d75568f16: Move INVLPG to pmap_quick_enter_page() from pmap_quick_remove_page(). (authored by kib).Dec 31 2022, 10:09 PM

kib added an edge: D37770: amd64: for small cores, use (big hammer) INVPCID_CTXGLOB instead of INVLPG.

ehem_freebsd_m5p.com mentioned this in D37770: amd64: for small cores, use (big hammer) INVPCID_CTXGLOB instead of INVLPG.Jan 4 2023, 5:30 AM

kib mentioned this in rG4ab02274ed39: Move INVLPG to pmap_quick_enter_page() from pmap_quick_remove_page()..Jan 20 2023, 3:30 AM

Changes (1)

Path

Size

sys/

amd64/

amd64/

rG231d75568f16

sys/amd64/amd64/pmap.c

Loading...