Messages in this thread | | | Date | Thu, 03 Aug 2006 09:56:09 -0400 | From | Shailabh Nagar <> | Subject | Re: [patch 1/3] basic accounting over taskstats |
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Andrew Morton wrote:
> > Or we remove this field altogether, perhaps. The same info is available > from /proc/pid/stat anyway. Is it really needed? >
Gathering this data in userspace from /proc might be difficult esp. for short-lived tasks.
Also, /proc may not be mounted ? I'd heard somewhere that some sysadmins don't install /proc for security reasons. Don't know how far thats true.
Several other fields, totalling 58 bytes, added by the CSA patches are also duplicated in /proc/pid/stat. But all of them could change in value during the lifetime of a task so I'm guessing its not useful to get them from /proc even if some kind of userspace polling of the value was possible.
But if there is a way, it would sure save a lot of payload sent over taskstats !
"duplicate" fields from CSA: + __u8 ac_nice; /* task_nice */ + char ac_comm[TS_COMM_LEN]; /* Command name */ + __u8 ac_sched; /* Scheduling discipline */ + __u32 ac_pid; /* Process ID */ + __u32 ac_ppid; /* Parent process ID */ + __u64 ac_utime; /* User CPU time [usec] */ + __u64 ac_stime; /* SYstem CPU time [usec] */ + __u64 ac_minflt; /* Minor Page Fault */ + __u64 ac_majflt; /* Major Page Fault */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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