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 2.6. July 2010 PROC_FLUSH_TASK(9)
