Having a global variabled called "hash_table" is not a good idea, it
should be static, so mark it as such.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Store sum of dead task io stats in uid_entry and defer uid io
calulation until next uid proc stat change or dumpsys.
Bug: 37754877
Change-Id: I970f010a4c841c5ca26d0efc7e027414c3c952e0
Signed-off-by: Jin Qian <jinqian@google.com>
struct task_struct *task should be proteced by tasklist_lock.
Change-Id: Iefcd13442a9b9d855a2bbcde9fd838a4132fee58
Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
(cherry picked from commit 90d78776c4a0e13fb7ee5bd0787f04a1730631a6)
Replaced read_lock with rcu_read_lock to reduce time that preemption
is disabled.
Added a function to update io stats for specific uid and moved
hash table lookup, user_namespace out of loops.
Bug: 37319300
Change-Id: I2b81b5cd3b6399b40d08c3c14b42cad044556970
Signed-off-by: Jin Qian <jinqian@google.com>
We see this happens multiple times in heavy workload in systrace
and AMS stuck in uid_lock.
Running process: Process 953
Running thread: android.ui
State: Uninterruptible Sleep
Start:
1,025.628 ms
Duration:
27,955.949 ms
On CPU:
Running instead: system_server
Args:
{kernel callsite when blocked:: "uid_procstat_write+0xb8/0x144"}
Changing to rt_mutex can mitigate the priority inversion
Bug: 34991231
Bug: 34193533
Change-Id: I481baad840b7bc2dfa9b9a59b4dff93cafb90077
Test: on marlin
Signed-off-by: Wei Wang <wvw@google.com>
A task can cancel writes made by other tasks. In rare cases,
cancelled_write_bytes is larger than write_bytes if the task
itself didn't make any write. This doesn't affect total size
but may cause confusion when looking at IO usage on individual
tasks.
Bug: 35851986
Change-Id: If6cb549aeef9e248e18d804293401bb2b91918ca
Signed-off-by: Jin Qian <jinqian@google.com>
No need to aggregate the switched uid separately since
update_io_stats_locked covers all uids.
Bug: 34198239
Change-Id: Ifed347264b910de02e3f3c8dec95d1a2dbde58c0
Signed-off-by: Jin Qian <jinqian@google.com>
This module tracks cputime and io stats.
Signed-off-by: Jin Qian <jinqian@google.com>
Bug: 34198239
Change-Id: I9ee7d9e915431e0bb714b36b5a2282e1fdcc7342
Greg Kroah-Hartman