novox/mesh-catalog
8
0
Fork 0
Code Issues Pull Requests 6 Actions Packages Projects Releases Wiki Activity

Add the kernel module: transparent huge pages set per machine (hq issue 746, ADR 0369) #310

Merged
mesh-admin merged 2 commits from fix/746-huge-pages-madvise into main 2026-10-14 21:52:50 +00:00
Conversation 3 Commits 2 Files Changed 10
+917
2 Commits
Author SHA1 Message Date
jschoubben ab1811d003 Reload, not restart, the huge pages unit when the setting changes (hq issue 746)
mesh/merge-gate head ab1811d00357 merged into trunk c79337579d6b — pass: builds new: modules/kernel, sent nowhere; no bus step; every machine composes with…
Details
mesh/repo-check head ab1811d00357 merged into trunk c79337579d6b — pass: its merge-check.sh passed, each part in its toolchain: merge-check.sh (go), merge-…
Details
mesh/delivery delivered
Details 
A restart ran restore then apply, so every change passed back through the
found mode and rotated the journal again. Reload applies the new value
directly; restore also drops its state; no rotation while the machine boots;
the unit is sandboxed.
 2026-10-14 23:42:49 +02:00
jschoubben 3a84044ece Add the kernel module: transparent huge pages set per machine (hq issue 746) 
With THP 'always' journald's mmapped journal files sit in 2 MiB folios, so each small
journal write dirties and writes back 2 MiB; on the control node that saturated the
root mirror holding the bus store and the store, and the controller lost its lease.
The module sets the mode from a per-machine setting (default always, the kernel's own,
so assigning it changes nothing until a machine sets madvise), verifies it took, rotates
the journal once so new files are mapped under the new mode, gives back what it found
when stopped, and serves kernel_huge_pages to measure file_thp per unit.
 2026-10-14 23:31:13 +02:00