From: Cyril Hrubis <chrubis@suse.cz>
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, 28 Jan 2021 16:37:38 +0100 [thread overview]
Message-ID: <YBLaQvt2g3z8Xy1A@yuki.lan> (raw)
In-Reply-To: <1611654925-8994-2-git-send-email-xuyang2018.jy@cn.fujitsu.com>
Hi!
> "The number of bytes in blocks currently allocated using mmap(2).".
> For allocations greater than or equal to 128K and that can't be satisfied from
> the free list, the memory-allocation functions employ mmap(2) instead of increasing
> the program break using sbrk(2).
>
> In this case, we test 20k size to use sbrk and 128k size to use mmap.
The size when glibc uses mmap() instead of heap is libc implementation
detail. I'm not sure that we want to have that value hardcoded in a LTP test.
Also glibc documentation says:
The default value is set to `131072' bytes and the threshold is adjusted
dynamically to suit the allocation patterns of the program.
--
Cyril Hrubis
chrubis@suse.cz
next prev parent reply other threads:[~2021-01-28 15:37 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 [this message]
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
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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