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This PR adds GC for ZNS. Here's how it works: * We use the statistics interface added in bzbd/zenfs#6, where we can get what size each file occupies in each zone. * We spawn a ZNSGC task in the background, which works like TTLGC. It polls statistics from ZenFS every 10s. * The task will find all full zones with 50% garbage (by default) and mark files in that zone for GC. Along with ZNS GC, other features are added. * We added `zenfs_gc_ratio` option in db_bench command. * We fixed a bug where files may be deleted before closed. Signed-off-by: Alex Chi <iskyzh@gmail.com>
Signed-off-by: Alex Chi <iskyzh@gmail.com>
Signed-off-by: Alex Chi <iskyzh@gmail.com>
levichen94
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Original commit message: This PR adds GC for ZNS. Here's how it works: We use the statistics interface added in fs: add statistics bzbd/zenfs#6, where we can get what size each file occupies in each zone. We spawn a ZNSGC task in the background, which works like TTLGC. It polls statistics from ZenFS every 10s. The task will find all full zones with 50% garbage (by default) and mark files in that zone for GC. Along with ZNS GC, other features are added. We added zenfs_gc_ratio option in db_bench command. We fixed a bug where files may be deleted before closed. ---------------------------------------------------------------------- Author: Alex Chi iskyzh@gmail.com Signed-off-by: Changlong Chen chenchanglong@bytedance.com
levichen94
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Sep 14, 2021
This PR adds GC for ZNS. Here's how it works: * We use the statistics interface added in bzbd/zenfs#6, where we can get what size each file occupies in each zone. * We spawn a ZNSGC task in the background, which works like TTLGC. It polls statistics from ZenFS every 10s. * The task will find all full zones with 50% garbage (by default) and mark files in that zone for GC. Along with ZNS GC, other features are added. * We added `zenfs_gc_ratio` option in db_bench command. * We fixed a bug where files may be deleted before closed. Signed-off-by: Alex Chi <iskyzh@gmail.com>
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This PR adds statistics API for ZenFS. Users can get statistics information from
zenFS->GetStat(). It is also possible to print statistics in human-readable format with ZenFS cli tool./zenfs stat --zbd=nvme3n2.Example output from the cli tool:
Signed-off-by: Alex Chi iskyzh@gmail.com