The patch titled
Subject: mm/hugetlb: hugetlb_no_page: Rate-limit warning message
has been added to the -mm tree. Its filename is
mm-hugetlb-hugetlb_no_page-rate-limit-warning-message.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-hugetlb_no_page-rate-limit-warning-message.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-hugetlb_no_page-rate-limit-warning-message.patch
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------------------------------------------------------
From: Geoffrey Thomas <geofft@xxxxxxxxxxxxx>
Subject: mm/hugetlb: hugetlb_no_page: Rate-limit warning message
The warning message "killed due to inadequate hugepage pool" simply
indicates that SIGBUS was sent, not that the process was forcibly killed.
If the process has a signal handler installed does not fix the problem,
this message can rapidly spam the kernel log.
On my amd64 dev machine that does not have hugepages configured, I can
reproduce the repeated warnings easily by setting vm.nr_hugepages=2 (i.e.,
4 megabytes of huge pages) and running something that sets a signal
handler and forks, like
#include <sys/mman.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
sig_atomic_t counter = 10;
void handler(int signal) {
if (counter-- == 0)
exit(0);
}
int main(void) {
int status;
char *addr = mmap(NULL, 4 * 1048576, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0);
if (addr == MAP_FAILED) {perror("mmap"); return 1;}
*addr = 'x';
switch (fork()) {
case -1:
perror("fork"); return 1;
case 0:
signal(SIGBUS, handler);
*addr = 'x';
break;
default:
*addr = 'x';
wait(&status);
if (WIFSIGNALED(status)) {
psignal(WTERMSIG(status), "child");
}
break;
}
}
Signed-off-by: Geoffrey Thomas <geofft@xxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/hugetlb.c~mm-hugetlb-hugetlb_no_page-rate-limit-warning-message mm/hugetlb.c
--- a/mm/hugetlb.c~mm-hugetlb-hugetlb_no_page-rate-limit-warning-message
+++ a/mm/hugetlb.c
@@ -3502,7 +3502,7 @@ static int hugetlb_no_page(struct mm_str
* COW. Warn that such a situation has occurred as it may not be obvious
*/
if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) {
- pr_warning("PID %d killed due to inadequate hugepage pool\n",
+ pr_warn_ratelimited("PID %d killed due to inadequate hugepage pool\n",
current->pid);
return ret;
}
_
Patches currently in -mm which might be from geofft@xxxxxxxxxxxxx are
mm-hugetlb-hugetlb_no_page-rate-limit-warning-message.patch
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