Commit 352c912b authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

tsacct: add 64-bit btime field 



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: default avatarArnd Bergmann <arnd@arndb.de>
parent 2d602bf2

include/uapi/linux/taskstats.h

+4 −1
Original line number Diff line number Diff line
@@ -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 */

};

kernel/tsacct.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

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