delayacct: track delays from memory compact

delayacct: track delays from memory compact

Delay accounting does not track the delay of memory compact.  When there
is not enough free memory, tasks can spend a amount of their time waiting
for compact.

To get the impact of tasks in direct memory compact, measure the delay
when allocating memory through memory compact.

Also update tools/accounting/getdelays.c:
/ # ./getdelays_next  -di -p 304
print delayacct stats ON
printing IO accounting
PID     304

CPU             count     real total  virtual total    delay total  delay average
                  277      780000000      849039485       18877296          0.068ms
IO              count    delay total  delay average
                    0              0              0ms
SWAP            count    delay total  delay average
                    0              0              0ms
RECLAIM         count    delay total  delay average
                    5    11088812685           2217ms
THRASHING       count    delay total  delay average
                    0              0              0ms
COMPACT         count    delay total  delay average
                    3          72758              0ms
watch: read=0, write=0, cancelled_write=0

Link: https://lkml.kernel.org/r/1638619795-71451-1-git-send-email-wang.yong12@zte.com.cn
Signed-off-by: wangyong <wang.yong12@zte.com.cn>
Reviewed-by: Jiang Xuexin <jiang.xuexin@zte.com.cn>
Reviewed-by: Zhang Wenya <zhang.wenya1@zte.com.cn>
Reviewed-by: Yang Yang <yang.yang29@zte.com.cn>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>