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rusage: Add comment on counting COW-source pointed-to by only fileobj

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Change-Id: I082f6738dd29257c05e8a0e4b0af23dd8ffab449
This commit is contained in:
Masamichi Takagi
2019-07-04 13:29:04 +09:00
parent b55e164669
commit 4cee9b1a27
1 changed files with 10 additions and 3 deletions
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13
kernel/process.c
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@@ -2013,9 +2013,16 @@ retry:
__FUNCTION__, virt, phys_to_virt(phys), virt_to_phys(virt), phys, pgsize); __FUNCTION__, virt, phys_to_virt(phys), virt_to_phys(virt), phys, pgsize);
memcpy(virt, phys_to_virt(phys), pgsize); memcpy(virt, phys_to_virt(phys), pgsize);
/* Call rusage_memory_stat_add() because remote page fault may create a page not pointed-to by PTE */ /* Count COW-source pointed-to by only fileobj
if(rusage_memory_stat_add(range, phys, pgsize, pgsize)) { * The steps in test/rusage/005:
dkprintf("%lx+,%s: remote page fault + cow, calling memory_stat_rss_add(),pgsize=%ld\n", * (1) Private-map regular file
* (2) Don't touch the page
* (3) Fork and then the child touches the page
* (4) Page-in the COW-source
* (5) Reach here
*/
if (rusage_memory_stat_add(range, phys, pgsize, pgsize)) {
dkprintf("%lx+,%s: COW-source pointed-to by only fileobj, calling memory_stat_rss_add(),pgsize=%ld\n",
phys, __FUNCTION__, pgsize); phys, __FUNCTION__, pgsize);
} }
if (page) { if (page) {