diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2019-10-24 16:47:56 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-12-18 18:07:31 +0100 |
| commit | 352c912b0a525977a8e6fa1f87c15d9f71943642 (patch) | |
| tree | d0059a3d25f1fae377e927c529e63defbf483265 | |
| parent | 2d602bf28316e2f61a553f13d279f3d74c2e5189 (diff) | |
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: Arnd Bergmann <arnd@arndb.de>
| -rw-r--r-- | include/uapi/linux/taskstats.h | 5 | ||||
| -rw-r--r-- | kernel/tsacct.c | 1 |
2 files changed, 5 insertions, 1 deletions
diff --git a/include/uapi/linux/taskstats.h b/include/uapi/linux/taskstats.h index 7d3ea366e93b..ccbd08709321 100644 --- a/include/uapi/linux/taskstats.h +++ b/include/uapi/linux/taskstats.h @@ -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 */ }; diff --git a/kernel/tsacct.c b/kernel/tsacct.c index ab12616ee6fb..257ffb993ea2 100644 --- a/kernel/tsacct.c +++ b/kernel/tsacct.c @@ -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; |