PROC_FLUSH_TASK(9)                     The proc filesystem                     PROC_FLUSH_TASK(9)



NAME
       proc_flush_task - Remove dcache entries for task from the /proc dcache.

SYNOPSIS
       void proc_flush_task(struct task_struct * task);

ARGUMENTS
       task
           task that should be flushed.

DESCRIPTION
       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
       this job.

       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.

NOTE
       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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                        PROC_FLUSH_TASK(9)