proc_flush_task — Remove dcache entries for task from the /proc dcache.
task that should be flushed.
Looks in the dcache for /proc/pid /proc/tgid/task/pid if either directory is present flushes it and all of it'ts children from the dcache.
It is safe and reasonable to cache /proc entries for a task until that task exits. After that they just clog up the dcache with useless entries, possibly causing useful dcache entries to be flushed instead. This routine is proved to flush those useless dcache entries at process exit time.
Looks in the dcache for /proc/pid /proc/tgid/task/pid if either directory is present flushes it and all of it'ts children from the dcache.
It is safe and reasonable to cache /proc entries for a task until that task exits. After that they just clog up the dcache with useless entries, possibly causing useful dcache entries to be flushed instead. This routine is proved to flush those useless dcache entries at process exit time.
This routine is just an optimization so it does not guarantee that no dcache entries will exist at process exit time it just makes it very unlikely that any will persist.