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library: tweak newly added MemAvailable fall-back code

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This commit just ensures recalculation of some amounts
for iterative processes, like top. It also trades some
repeated runtime calls to sysconf for a one time cost.

Reference(s):
http://www.freelists.org/post/procps/systemd-support-to-library,7
. fall-back calculations
commit b779855cf15d68f9038ff1809db18c0788e9ae70

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2014-07-17 11:11:11 -05:00 committed by Jaromir Capik
parent 6c148b4f8b
commit e4f0b4ebf3
3 changed files with 7 additions and 2 deletions
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1
proc/libprocps.sym
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@ -44,6 +44,7 @@ global:
open_psdb; open_psdb;
open_psdb_message; open_psdb_message;
openproc; openproc;
page_bytes;
pretty_print_signals; pretty_print_signals;
print_uptime; print_uptime;
procps_version; procps_version;

7
proc/sysinfo.c
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@ -37,6 +37,7 @@
#endif #endif
long smp_num_cpus; /* number of CPUs */ long smp_num_cpus; /* number of CPUs */
long page_bytes; /* this architecture's page size */
#define BAD_OPEN_MESSAGE \ #define BAD_OPEN_MESSAGE \
"Error: /proc must be mounted\n" \ "Error: /proc must be mounted\n" \
@ -277,6 +278,7 @@ static void init_libproc(void){
init_Linux_version(); /* Must be called before we check code */ init_Linux_version(); /* Must be called before we check code */
cpuinfo(); cpuinfo();
page_bytes = sysconf(_SC_PAGESIZE);
#ifdef __linux__ #ifdef __linux__
if(linux_version_code > LINUX_VERSION(2, 4, 0)){ if(linux_version_code > LINUX_VERSION(2, 4, 0)){
@ -661,6 +663,7 @@ void meminfo(void){
FILE_TO_BUF(MEMINFO_FILE,meminfo_fd); FILE_TO_BUF(MEMINFO_FILE,meminfo_fd);
kb_inactive = ~0UL; kb_inactive = ~0UL;
kb_low_total = kb_main_available = 0;
head = buf; head = buf;
for(;;){ for(;;){
@ -704,7 +707,7 @@ nextline:
- watermark_low; - watermark_low;
if (mem_available < 0) mem_available = 0; if (mem_available < 0) mem_available = 0;
kb_main_available = (unsigned long)((unsigned long long)mem_available * sysconf(_SC_PAGESIZE) / 1024ull); kb_main_available = (unsigned long)((unsigned long long)mem_available * page_bytes / 1024ull);
} }
} }
@ -888,7 +891,7 @@ nextline:
vm_pgsteal = vm_pgsteal_dma + vm_pgsteal_high + vm_pgsteal_normal; vm_pgsteal = vm_pgsteal_dma + vm_pgsteal_high + vm_pgsteal_normal;
FILE_TO_BUF(VM_MIN_FREE_FILE, vm_min_free_fd); FILE_TO_BUF(VM_MIN_FREE_FILE, vm_min_free_fd);
vm_min_free = (unsigned long) (strtoull(buf,&tail,10) * 1024ull / sysconf(_SC_PAGESIZE)); vm_min_free = (unsigned long) (strtoull(buf,&tail,10) * 1024ull / page_bytes);
} }
/////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////

1
proc/sysinfo.h
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@ -9,6 +9,7 @@ EXTERN_C_BEGIN
extern unsigned long long Hertz; /* clock tick frequency */ extern unsigned long long Hertz; /* clock tick frequency */
extern long smp_num_cpus; /* number of CPUs */ extern long smp_num_cpus; /* number of CPUs */
extern int have_privs; /* boolean, true if setuid or similar */ extern int have_privs; /* boolean, true if setuid or similar */
extern long page_bytes; /* this architecture's bytes per page */
#if 0 #if 0
#define JT double #define JT double