proc_flush_task(9) - phpMan
PROC_FLUSH_TASK(9) The proc filesystem PROC_FLUSH_TASK(9)
proc_flush_task - Remove dcache entries for task from the /proc dcache.
void proc_flush_task(struct task_struct * task);
task that should be flushed.
When flushing dentries from proc, one needs to flush them from global proc (proc_mnt) and
from all the namespaces' procs this task was seen in. This call is supposed to do all of
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.
Kernel Hackers Manual 4.8. January 2017 PROC_FLUSH_TASK(9)