Linus Torvalds just released Linux 5.19-rc4. Compared to previous release candidates, this week’s patch incorporates more patches, but the scale is still under control. Linus Torvalds commented on the 5.19-rc4 announcement: “After a couple of fairly small RC releases, rc4 commits are finally starting to go up. Naturally, I wouldn’t expect this to happen mid-release, but given the current lull I don’t think it’s surprising.”
He continued: “While 5.19-rc4 is a bit bigger compared to previous RC versions and a bit bigger than previous Linux versions, it’s not close to the record. So rc4 is just a bit bigger than usual, not ‘Oh my God, this thing is huge”.
A change found in Linux 5.19-rc4 is a fix for performance regressions. As early as March during the Linux 5.19 merge window, Phoronix pointed out a large NUMA regression problem in Stress-NG during the Linux 5.18 feature change.
This patch is in Linux 5.19-rc4 and is expected to be rolled back to Linux 5.18 as well. This patch is a modification of “mm: lru_cache_disable: use synchronize_rcu_expedited”. The rest of the patch fixes are fairly routine and nothing too noteworthy.
The Linux 5.19 stable kernel should be released around the end of July.
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