[pbs-devel] [PATCH proxmox-backup] task tracking: improve pruning of reused-PID stale entries

[Fabian Grünbichler]

On November 17, 2025 9:58 am, Hannes Laimer wrote:
> Keep entries only when check_process_running(pid) reports a
> starttime equal to the stored one. This improves pruning of stale
> entries for all PIDs (not just the current one) and aligns update
> with the read path. Counting behavior and semantics are unchanged.

I don't think this is correct? the starttime comparison is only valid
for the current process, an old process will almost certainly have a
different starting time and we still want to keep its entry if it is
still running..

if we want to improve this, we would need to query the process starttime
for all entries, and then compare, but that would make this more
expensive..

> 
> Signed-off-by: Hannes Laimer <h.laimer at proxmox.com>
> ---
> noticed while looking through recent proposed changes to the tracking
> logic. this isn't a problem, but should keep the tracking file cleaner
> and remove a match arm in the code
> 
>  pbs-datastore/src/task_tracking.rs | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/pbs-datastore/src/task_tracking.rs b/pbs-datastore/src/task_tracking.rs
> index 44a4522d..4fcbbaa4 100644
> --- a/pbs-datastore/src/task_tracking.rs
> +++ b/pbs-datastore/src/task_tracking.rs
> @@ -114,8 +114,7 @@ pub fn update_active_operations(
>              .iter_mut()
>              .filter_map(
>                  |task| match procfs::check_process_running(task.pid as pid_t) {
> -                    Some(stat) if pid == task.pid && stat.starttime != task.starttime => None,
> -                    Some(_) => {
> +                    Some(stat) if stat.starttime == task.starttime => {
>                          if pid == task.pid {
>                              found_entry = true;
>                              match operation {
> -- 
> 2.47.3
> 
> 
> 
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> 
>