pkg/sysinfo.applyPIDSCgroupInfo: optimize #41014
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For some reason, commit 69cf037 chose not to use information already fetched, and called cgroups.FindCgroupMountpoint() instead. This is not a cheap call, as it has to parse the whole nine yards of /proc/self/mountinfo, and the info which it tries to get (whether the pids controller is present) is already available from cgMounts map. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Some were misleading or vague, some were plain wrong. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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@thaJeztah PTAL |
AkihiroSuda
approved these changes
May 24, 2020
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@kolyshkin do you know how much time we save with this? Wondering if we should backport this (given that the fix itself is tiny and trivial), or not worth the effort? |
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Up to 0.01s in busy scenarios, much less so on a relatively idle system. If it's a straightforward backport, I'd do it |
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For some reason, commit 69cf037 (PR #18697) chose not to use information
already fetched, and called
cgroups.FindCgroupMountpoint()instead.This is not a cheap call, as it has to parse the whole nine yards
of /proc/self/mountinfo, and the info which it tries to get (whether
the pids controller is present) is already available from
cgMountsmap.