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allocator: Ignore madvise ENOSYS error

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Support kernels built without CONFIG_ADVISE_SYSCALLS on small
embedded devices.
This commit is contained in:
klzgrad 2022-11-12 15:13:24 +08:00
parent 81e86afa3e
commit e998809fd2
1 changed files with 6 additions and 1 deletions
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7
src/base/allocator/partition_allocator/page_allocator_internals_posix.h
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@ -394,7 +394,12 @@ void DiscardSystemPagesInternal(uintptr_t address, size_t length) {
// performance benefits unclear.
//
// Therefore, we just do the simple thing: MADV_DONTNEED.
PA_PCHECK(0 == madvise(ptr, length, MADV_DONTNEED));
int ret = madvise(ptr, length, MADV_DONTNEED);
if (ret && errno == ENOSYS) {
// Ignores when the kernel is built without CONFIG_ADVISE_SYSCALLS
return;
}
PA_PCHECK(ret == 0);
#endif // BUILDFLAG(IS_APPLE)
}