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| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2026-06-30 09:31:57 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@kernel.org> | 2026-07-07 23:52:52 +0200 |
| commit | 43648f9f3a67125ba649027a5be00bc005065482 (patch) | |
| tree | 31332c802bbfe95b0363c02b2bcf0dd4ae18f4d8 /tools/perf/scripts/python/flamegraph.py | |
| parent | 7557273419dd618df6d83ed37449b0e5918fd501 (diff) | |
vdso/datastore: Map zeroed pages for unavailable data
mlockall() stops if a page in a VMA is unmappable. As the datastore VMA
can contain holes, mlockall() would not process all data pages.
Replace the mapping error VM_FAULT_SIGBUS by just mapping the underlying
unused and zeroed-out data page. The vDSO will not access these pages in
any case and for other userspace these pages have undefined contents.
This will allow mlockall() to process all pages within the VMA as soon
as VM_IO is removed from the VMA.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20260630-vdso-mlockall-v4-3-6c93708ce723@linutronix.de
Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')
0 files changed, 0 insertions, 0 deletions