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README: say kernel 4.15 is the minimum recommended

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After various long discussions
(https://lists.freedesktop.org/archives/systemd-devel/2022-March/047587.html,
https://lwn.net/Articles/889610/), there is no clear answer what the minimum
version should be. Bumping the version above 3.15 doesn't allow us to make any
significant simplifications (unless we went *much* higher). In particular, even
renameat2() is not fully supported with latest kernel versions, e.g. nfs still
doesn't have it. And the bpf stuff is optional anyway. So let's just say that
4.15 is what we recommend, because it provides fairly complete cgroups-v2, but
without any removals of compat in the code.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2022-04-05 20:30:00 +02:00
parent 42ac3bf1a3
commit 277f05872f
2 changed files with 16 additions and 9 deletions
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src/basic/def.h
+1 -1
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@@ -74,4 +74,4 @@
/* Path where systemd-oomd listens for varlink connections from user managers to report changes in ManagedOOM settings. */
#define VARLINK_ADDR_PATH_MANAGED_OOM_USER "/run/systemd/oom/io.system.ManagedOOM"
#define KERNEL_BASELINE_VERSION "3.15"
#define KERNEL_BASELINE_VERSION "4.15"