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zos: read more accurate rss info from RSM

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More accurate Resident Set Size (Central Storage size on Z)
is stored in the MVS Data Areas managed by the RSM (Real
Storage Manager).

PR-URL: https://github.com/libuv/libuv/pull/1244
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
This commit is contained in:
John Barboza 2017-03-09 19:57:28 -05:00 committed by Ben Noordhuis
parent 095e07cd79
commit 371ca6d4b2
1 changed files with 22 additions and 5 deletions
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27
src/unix/os390.c
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@ -33,6 +33,7 @@
#endif
#define CVT_PTR 0x10
#define PSA_PTR 0x00
#define CSD_OFFSET 0x294
/*
@ -70,6 +71,18 @@
/* CPC model length from the CSRSI Service. */
#define CPCMODEL_LENGTH 16
/* Pointer to the home (current) ASCB. */
#define PSAAOLD 0x224
/* Pointer to rsm address space block extension. */
#define ASCBRSME 0x16C
/*
NUMBER OF FRAMES CURRENTLY IN USE BY THIS ADDRESS SPACE.
It does not include 2G frames.
*/
#define RAXFMCT 0x2C
/* Thread Entry constants */
#define PGTH_CURRENT 1
#define PGTH_LEN 26
@ -342,13 +355,17 @@ uint64_t uv_get_total_memory(void) {
int uv_resident_set_memory(size_t* rss) {
W_PSPROC buf;
char* psa;
char* ascb;
char* rax;
size_t nframes;
memset(&buf, 0, sizeof(buf));
if (w_getpsent(0, &buf, sizeof(W_PSPROC)) == -1)
return -EINVAL;
psa = PSA_PTR;
ascb = *(char* __ptr32 *)(psa + PSAAOLD);
rax = *(char* __ptr32 *)(ascb + ASCBRSME);
nframes = *(unsigned int*)(rax + RAXFMCT);
*rss = buf.ps_size;
*rss = nframes * sysconf(_SC_PAGESIZE);
return 0;
}