diff options
| author | Chris Webb <chris@arachsys.com> | 2023-12-09 12:49:12 +0000 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-12-09 23:26:29 -0500 |
| commit | ddc71615311b9f134f6e1c3caaf6ff7bf1bddaeb (patch) | |
| tree | 9aa3a60c96aead6ba61591f55c97db3458f0f656 /include/linux | |
| parent | 2d5118e01fddf09a9f9b9713d857b70515cc9b4b (diff) | |
bcachefs-tools: Use sysinfo(2) directly to implement si_meminfo()
Use a single sysinfo(2) call to fill out struct sysinfo instead of
multiple libc sysconf(3) requests, which will only make sysinfo(2) calls
internally anyway. This also enables us to access other struct sysinfo
fields, not just the three filled-out previously.
As we provide our own definition of struct sysinfo in include/linux/mm.h
to match the kernel, which is not guaranteed to align with the definition
libc provides in <sys/sysinfo.h>, use syscall(SYS_sysinfo, ...) directly
instead of the libc wrapper.
Signed-off-by: Chris Webb <chris@arachsys.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 4bf80ba3..744a14ce 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2,6 +2,7 @@ #ifndef _TOOLS_LINUX_MM_H #define _TOOLS_LINUX_MM_H +#include <sys/syscall.h> #include <linux/types.h> struct sysinfo { @@ -20,6 +21,11 @@ struct sysinfo { __u32 mem_unit; /* Memory unit size in bytes */ }; -extern void si_meminfo(struct sysinfo * val); + + +static inline void si_meminfo(struct sysinfo *val) +{ + BUG_ON(syscall(SYS_sysinfo, val)); +} #endif /* _TOOLS_LINUX_MM_H */ |