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base/allocator: Fix recommitted pages not being zeroed when madvise is not available.

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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 8f2b611f24
commit 8de867f7b0
2 changed files with 5 additions and 0 deletions
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2
src/base/allocator/partition_allocator/src/partition_alloc/page_allocator.h
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@ -261,6 +261,8 @@ constexpr PA_COMPONENT_EXPORT(
PARTITION_ALLOC) bool DecommittedMemoryIsAlwaysZeroed() {
#if PA_BUILDFLAG(IS_APPLE)
return false;
#elif defined(NO_MADVISE_SYSCALL)
return false;
#else
return true;
#endif

3
src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.h
View File

@ -418,6 +418,9 @@ void DiscardSystemPagesInternal(uintptr_t address, size_t length) {
ret = madvise(ptr, length, MADV_DONTNEED);
}
PA_PCHECK(ret == 0);
#elif defined(NO_MADVISE_SYSCALL)
static_cast<void>(ptr);
static_cast<void>(length);
#else // PA_BUILDFLAG(IS_APPLE)
// We have experimented with other flags, but with suboptimal results.
//