Fix issues with vanishing PIDs when calling "enroot list -f" - #220
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Fixes: NVIDIA#126 Signed-off-by: Felix Abecassis <fabecassis@nvidia.com>
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runtime::list() calls "ps -p" separately for each rootfs entry, in alphabetical order, after the initial lsns scan that found the pids. Entries later in that order get checked further away in time from when lsns saw them running, so the staleness window NVIDIA#126/NVIDIA#220 already deal with is not fixed size, it grows with the number of running containers. Measured on an idle VM with N containers running: the gap between the lsns scan and each entry per-entry ps call went from ~46ms (1st entry) to ~286ms (40th entry), growing roughly linearly with N. Batching a single "ps -p" call right after the lsns scan and having the rest of the function work off that one snapshot keeps this at a flat ~40ms regardless of N. Ran the NVIDIA#126 repro (owner exits mid-list) 8x against this, still degrades gracefully to a name-only row like NVIDIA#220 intended, no regression there. Signed-off-by: Liang Yan <lyan@coreweave.com>
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Fixes: #126