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test: specialize OOM check for AIX

Assumption that if memory can be malloc()ed it can be used is not true
on AIX. Later access of the allocated pages can trigger SIGKILL if there
are insufficient VM pages.

Use psdanger() to better estimate available memory.

Fixes: nodejs/build#1849

More info:
- https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/generalprogramming/sys_mem_alloc.html
- https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/p_bostechref/psdanger.html

Related to:
- nodejs/build#1820 (comment)
- #28469
- #28516

PR-URL: #28857
Backport-PR-URL: #29599
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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sam-github authored and BethGriggs committed Jul 24, 2019
1 parent 7aca9cb commit 65e9b0f5a22c7a54e7b1759671f18c08731c3444
Showing with 31 additions and 15 deletions.
  1. +0 −14 test/addons/addon.status
  2. +31 −1 test/addons/stringbytes-external-exceed-max/binding.cc
@@ -3,17 +3,3 @@ prefix addons
[true] # This section applies to all platforms

[$system==aix]
# https://github.com/nodejs/build/issues/1820#issuecomment-505998851
# https://github.com/nodejs/node/pull/28469
# https://github.com/nodejs/node/pull/28516
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max.js: SKIP

# https://github.com/nodejs/node/pull/28516
stringbytes-external-exceed-max/test-stringbytes-external-at-max: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-ascii: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-base64: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-binary: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-hex: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-1-utf8: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max-by-2: SKIP
stringbytes-external-exceed-max/test-stringbytes-external-exceed-max: SKIP
@@ -2,12 +2,42 @@
#include <node.h>
#include <v8.h>

#ifdef _AIX
// AIX allows over-allocation, and will SIGKILL when the allocated pages are
// used if there is not enough VM. Check for available space until
// out-of-memory. Don't allow more then some (large) proportion of it to be
// used for the test strings, so Node & V8 have some space for allocations.
#include <signal.h>
#include <sys/vminfo.h>

static void* Allowed(size_t size) {
blkcnt_t allowedBlocks = psdanger(SIGKILL);

if (allowedBlocks < 1) {
// Already OOM
return nullptr;
}
const size_t BYTES_PER_BLOCK = 512;
size_t allowed = (allowedBlocks * BYTES_PER_BLOCK * 4) / 5;
if (size < allowed) {
return malloc(size);
}
return nullptr;
}
#else
// Other systems also allow over-allocation, but this malloc-and-free approach
// seems to be working for them.
static void* Allowed(size_t size) {
return malloc(size);
}
#endif // _AIX

void EnsureAllocation(const v8::FunctionCallbackInfo<v8::Value> &args) {
v8::Isolate* isolate = args.GetIsolate();
uintptr_t size = args[0]->IntegerValue();
v8::Local<v8::Boolean> success;

void* buffer = malloc(size);
void* buffer = Allowed(size);
if (buffer) {
success = v8::Boolean::New(isolate, true);
free(buffer);

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