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parse: prefault config file with MAP_POPULATE

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When we call lxc_file_for_each_line_mmap() we will always parse the
whole config file. Prefault it in case it is really long to optimize
performance.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-10-02 16:40:13 +02:00
parent 907e133201
commit 2291ea4a1a
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 2 additions and 1 deletions
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src/lxc/parse.c
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@ -88,7 +88,8 @@ int lxc_file_for_each_line_mmap(const char *file, lxc_file_cb callback,
return 0;
}
buf = lxc_strmmap(NULL, st.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
buf = lxc_strmmap(NULL, st.st_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_POPULATE, fd, 0);
if (buf == MAP_FAILED) {
close(fd);
return -1;