From: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH v1 2/3] syscalls/mallinfo02: Add a basic test to check use mmap or sbrk
Date: Thu, 4 Feb 2021 17:53:16 +0800 [thread overview]
Message-ID: <601BC40C.4030900@cn.fujitsu.com> (raw)
In-Reply-To: <CAEemH2efATKDx6T-j=GZKm6N4XZ3qTR22ZwzLPi5pBHkFkMEJQ@mail.gmail.com>
Hi Li
> Hi Xu,
>
> Yang Xu <xuyang2018.jy@cn.fujitsu.com
> <mailto:xuyang2018.jy@cn.fujitsu.com>> wrote:
>
> ...
>
> So I use this code "MAX(info.fordblks, 131072)" to get the right value
> to trigger mmap.
>
>
> My 2 cents:
>
> From what I understand, once we request memory larger than the upper
> limit DEFAULT_MMAP_THRESHOLD_MAX, Glibc will always make use
> of mmap() because it will be out of any value it can adjust in dynamical.
> So that we don't be bothered with this issue anymore.
But in subsequent malloc, the previous mmap area will add into arena and
we still will increase the threashold. I use 8M size to test.
>
> Or:
>
> Invoking mallopt(M_MMAP_THRESHOLD, ...) function in front of the
> SAFE_MALLOC helps to fix the threshold. In such a case, the dynamic
> adjustment of the mmap threshold will be disabled.
Yes, it works well. Thanks for your review.
>
> --
> Regards,
> Li Wang
next prev parent reply other threads:[~2021-02-04 9:53 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-26 9:55 [LTP] [PATCH v1 1/3] syscalls/mallinfo01: Add a basic test for mallinfo Yang Xu
2021-01-26 9:55 ` [LTP] [PATCH v1 2/3] syscalls/mallinfo02: Add a basic test to check use mmap or sbrk Yang Xu
2021-01-28 15:37 ` Cyril Hrubis
2021-02-03 9:47 ` Yang Xu
2021-02-03 10:46 ` Yang Xu
2021-02-04 6:08 ` Li Wang
2021-02-04 9:53 ` Yang Xu [this message]
2021-01-26 9:55 ` [LTP] [PATCH v1 3/3] syscalls/mallinfo03: Add an overflow test when setting 2G size Yang Xu
2021-01-28 15:42 ` Cyril Hrubis
2021-02-03 9:49 ` Yang Xu
2021-02-04 8:54 ` Li Wang
2021-02-04 10:01 ` Yang Xu
2021-02-04 13:56 ` Li Wang
2021-02-04 12:12 ` [LTP] [PATCH v2 1/5] tst_mallinfo.c: Add a common print helper for mallinfo Yang Xu
2021-02-04 12:12 ` [LTP] [PATCH v2 2/5] syscalls/mallopt01: Use tst_print_mallinfo api Yang Xu
2021-02-04 12:12 ` [LTP] [PATCH v2 3/5] syscalls/mallinfo01: Add a basic test for mallinfo Yang Xu
2021-02-04 12:12 ` [LTP] [PATCH v2 4/5] syscalls/mallinfo02: Add a basic test to check use mmap or sbrk Yang Xu
2021-02-04 13:51 ` Li Wang
2021-02-05 7:51 ` Yang Xu
2021-02-05 8:15 ` Yang Xu
2021-02-05 9:00 ` Yang Xu
2021-02-05 9:20 ` Li Wang
2021-02-04 12:12 ` [LTP] [PATCH v2 5/5] syscalls/mallinfo03: Add an overflow test when setting 2G size Yang Xu
2021-02-04 13:29 ` [LTP] [PATCH v2 1/5] tst_mallinfo.c: Add a common print helper for mallinfo Li Wang
2021-02-05 7:44 ` Yang Xu
2021-02-05 8:00 ` Li Wang
2021-02-05 11:21 ` Petr Vorel
2021-02-08 15:30 ` Cyril Hrubis
2021-02-18 5:52 ` [LTP] [PATCH v3 1/4] syscalls/mallinfo01: Add a basic test " Yang Xu
2021-02-18 5:52 ` [LTP] [PATCH v3 2/4] syscalls/mallopt01: Use unified print_mallinfo api Yang Xu
2021-02-18 5:52 ` [LTP] [PATCH v3 3/4] syscalls/mallinfo02: Add a basic test to check use mmap or sbrk Yang Xu
2021-02-22 6:32 ` Li Wang
2021-02-22 6:40 ` Yang Xu
2021-02-23 1:45 ` Yang Xu
2021-02-18 5:52 ` [LTP] [PATCH v3 4/4] syscalls/mallinfo03: Add an overflow test when setting 2G size Yang Xu
2021-01-28 15:50 ` [LTP] [PATCH v1 1/3] syscalls/mallinfo01: Add a basic test for mallinfo Cyril Hrubis
2021-02-03 6:03 ` Yang Xu
2021-02-04 6:42 ` Li Wang
2021-02-04 9:54 ` Yang Xu
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