linux-kernel - [sched/core] cpuacct

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Date:   Thu, 9 Nov 2017 17:51:59 +0300
From:   "Pavel V. Panteleev" <panteleev_p@...t.ru>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, zhaolei@...fujitsu.com
Subject: [sched/core] cpuacct_charge() problem

Hello!

task_pt_regs() always show on the user regs for user thread, even if 
it's working in kernel mode now. So, index calculation in 
cpuacct_charge() isn't correct and it's always  CPUACCT_STAT_USER for 
user thread. The time, spent in kernel mode for user task, will be lost:

int index = CPUACCT_STAT_SYSTEM;
struct pt_regs *regs = task_pt_regs(tsk);

if (regs && user_mode(regs))
     index = CPUACCT_STAT_USER;