----- Original Message -----
> From: "madhura" <[email protected]>
> To: [email protected]
> Sent: Thursday, January 17, 2013 7:48:49 PM
> Subject: [LTP] [PATCH] max_map_count: Fails due to negative memfree value
>
> In situations when memory is occupied to a certain higher limit by
> system processes, the amount of memory available may be in
> negative/low values not suitable for testing.
> Hence its better to have a memory check prior to the test beginning.
>
> Signed-off-by: Madhura P S <[email protected]>
>
> ---
> ltp-full-20130109/testcases/kernel/mem/tunable/max_map_count.c.org
> 2013-01-17 17:15:38.957032558 +0530
> +++ ltp-full-20130109/testcases/kernel/mem/tunable/max_map_count.c
> 2013-01-17 17:16:58.092909326 +0530
> @@ -152,7 +152,7 @@ static void max_map_count_test(void)
> pid_t pid;
> long max_maps;
> long map_count;
> - long max_iters;
> + long max_iters = 0;
> long memfree;
>
> /*
> @@ -174,7 +174,8 @@ static void max_map_count_test(void)
> */
> memfree = read_meminfo("CommitLimit:") -
> read_meminfo("Committed_AS:");
> /* 64 used as a bias to make sure no overflow happen */
> - max_iters = memfree / sysconf(_SC_PAGESIZE) * 1024 - 64;
> + if (memfree > 0)
> + max_iters = memfree / sysconf(_SC_PAGESIZE) * 1024 - 64;
Generally, the situation (CommitLimit < Committed_AS) can't be hit,
IMO, if yes, that means your system has been some broken(I suppose it's
kernel's issue)
so you should here add the below lines to catch the exception:
else {
tst_resm(TINFO, "CommmitLimit is %ld, Committed_AS"
" is %ld", commit_limit, committed);
tst_brkm(TBROK, cleanup, "Unexpected error: "
"CommitLimit < Committed_AS");
}
--
Thanks,
Zhouping
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