Use MemAvailable when it's available on Linux 3.14+ kernel #71
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monicasarbu
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sigar_linux_common.go
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| self.ActualFree = self.Free + kern | ||
| } | ||
| self.Used = self.Total - self.ActualFree | ||
| self.ActualUsed = self.Used |
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Leave actual memory usage like this for now, equal with the memory usage.
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sigar_linux_common.go
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| kern := buffers + cached | ||
| self.ActualFree = self.Free + kern | ||
| self.ActualUsed = self.Used - kern | ||
| if self.ActualFree > 0.0 { |
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You should be able to unit test this pretty easily by simulating the contents of the /proc/meminfo file.
With the current data structure it might not be possible to detect the difference between MemAvailable: 0 kB and MemAvailable not present. You don't want to fallback to the secondary calculation when MemAvailable: 0 kB so you might need to refactor.
if self.ActualFree > 0.0 { doesn't look right?
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That's a good point. I would need to refactor the code to be able to distinguish between MemAvailable: 0kB and MemAvailable not present.
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| meminfoContents := ` | ||
| MemTotal: 500184 kB | ||
| MemFree: 31360 kB | ||
| MemAvailable: 414168 kB |
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Could you please add a test case for when MemAvailable: 0 kB.
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We need a CHANGELOG entry too. |
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@andrewkroh Ready for the final review. |
CHANGELOG.md
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| @@ -33,6 +33,7 @@ This project adheres to [Semantic Versioning](http://semver.org/). | |||
| privileges in a process token. | |||
| - Added utility code for interfacing with linux NETLINK_INET_DIAG. #60 | |||
| - Added `ProcEnv` for getting a process's environment variables. #61 | |||
| - Read `MemAvailable` value for kernel 3.14+ | |||
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This should be up in the "unreleased" section.
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Done, thanks for noticing it.
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Update deps to include the latest changes from the elastic/gosigar#71 which includes a change to use `MemAvailable` on Linux. This closes #4202.
Use MemAvailable when it's available on Linux 3.14+ kernel, otherwise calculate it as free memory plus the caches and buffers.
(Fixes elastic/beats#4202)