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636592343c
The tmpfs memory reserve defaulted to 4 MB, and other than that, all of available memory + swap could be allocated to tmpfs files. This was dangerous, as the page daemon attempts to keep some memory free, using up swap, and then resulting in processes being killed. Increase the reserve to a fraction of available memory + swap at file system startup time. The limit is expressed as a percentage of available memory + swap that can be used, and defaults to 95%. The percentage can be changed via the vfs.tmpfs.memory_percent sysctl, recomputing the reserve with the new percentage but the initial available memory + swap. Note that the reserve can also be set directly with an existing sysctl, ignoring the percentage. The previous behavior can be specified by setting vfs.tmpfs.memory_percent to 100. Add sysctl for vfs.tmpfs.memory_percent and the pre-existing vfs.tmpfs.memory_reserved to tmpfs(5). PR: 275436 MFC after: 1 month Reviewed by: rgrimes Differential Revision: https://reviews.freebsd.org/D43011 |
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