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tsacct: add 64-bit btime field

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As there is only a 32-bit ac_btime field in taskstat and
we should handle dates after the overflow, add a new field
with the same information but 64-bit width that can hold
a full time64_t.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-10-24 16:47:56 +02:00
parent 2d602bf283
commit 352c912b0a
2 changed files with 5 additions and 1 deletions
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5
include/uapi/linux/taskstats.h
View File

@ -34,7 +34,7 @@
*/
#define TASKSTATS_VERSION 9
#define TASKSTATS_VERSION 10
#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */
@ -169,6 +169,9 @@ struct taskstats {
/* Delay waiting for thrashing page */
__u64 thrashing_count;
__u64 thrashing_delay_total;
/* v10: 64-bit btime to avoid overflow */
__u64 ac_btime64; /* 64-bit begin time */
};

1
kernel/tsacct.c
View File

@ -36,6 +36,7 @@ void bacct_add_tsk(struct user_namespace *user_ns,
/* Convert to seconds for btime (note y2106 limit) */
btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX);
stats->ac_btime64 = btime;
if (thread_group_leader(tsk)) {
stats->ac_exitcode = tsk->exit_code;