David Rientjes <rientjes@xxxxxxxxxx> writes: > On Wed, 6 Apr 2016, Andrew Morton wrote: > >> > This patchset continues the work I started with: >> > >> > commit 31bc3858ea3ebcc3157b3f5f0e624c5962f5a7a6 >> > Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> >> > Date: Tue Mar 15 14:56:48 2016 -0700 >> > >> > memory-hotplug: add automatic onlining policy for the newly added memory >> > >> > Initially I was going to stop there and bring the policy setting logic to >> > userspace. I met two issues on this way: >> > >> > 1) It is possible to have memory hotplugged at boot (e.g. with QEMU). These >> > blocks stay offlined if we turn the onlining policy on by userspace. >> > >> > 2) My attempt to bring this policy setting to systemd failed, systemd >> > maintainers suggest to change the default in kernel or ... to use tmpfiles.d >> > to alter the policy (which looks like a hack to me): >> > https://github.com/systemd/systemd/pull/2938 >> >> That discussion really didn't come to a conclusion and I don't >> understand why you consider Lennert's "recommended way" to be a hack? >> >> > Here I suggest to add a config option to set the default value for the policy >> > and a kernel command line parameter to make the override. >> >> But the patchset looks pretty reasonable regardless of the above. >> > > I don't understand why initscripts simply cannot crawl sysfs memory blocks > and online them for the same behavior. Yes, they can. With this patchset I don't bring any new features, it's rather a convenience so linux distros can make memory hotplug work 'out of the box' without such distro-specific initscripts. Memory hotplug is a standard feature of all major virt technologies so I think it's pretty reasonable to have an option to make it work 'by default' available. -- Vitaly -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
