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src: clean up large pages code #33255

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src: clean up large pages code #33255

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33 changes: 14 additions & 19 deletions src/large_pages/node_large_page.cc
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Expand Up @@ -106,18 +106,18 @@ namespace node {
namespace {

struct text_region {
char* from;
char* to;
int total_hugepages;
bool found_text_region;
char* from = nullptr;
char* to = nullptr;
bool found_text_region = false;
};

static const size_t hps = 2L * 1024 * 1024;

template <typename... Args>
inline void Debug(Args&&... args) {
inline void Debug(std::string fmt, Args&&... args) {
node::Debug(&per_process::enabled_debug_list,
DebugCategory::HUGEPAGES,
(std::string("Hugepages info: ") + fmt).c_str(),
std::forward<Args>(args)...);
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}

Expand Down Expand Up @@ -145,10 +145,10 @@ inline uintptr_t hugepage_align_down(uintptr_t addr) {
#endif // defined(__FreeBSD__)

struct dl_iterate_params {
uintptr_t start;
uintptr_t end;
uintptr_t reference_sym;
std::string exename;
uintptr_t start = 0;
uintptr_t end = 0;
uintptr_t reference_sym = reinterpret_cast<uintptr_t>(&__node_text_start);
std::string exename = "";
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Suggested change
std::string exename = "";
std::string exename;

(it's superfluous for std::string.)

};

int FindMapping(struct dl_phdr_info* info, size_t, void* data) {
Expand All @@ -175,11 +175,8 @@ int FindMapping(struct dl_phdr_info* info, size_t, void* data) {

struct text_region FindNodeTextRegion() {
struct text_region nregion;
nregion.found_text_region = false;
#if defined(__linux__) || defined(__FreeBSD__)
dl_iterate_params dl_params = {
0, 0, reinterpret_cast<uintptr_t>(&__node_text_start), ""
};
dl_iterate_params dl_params;
uintptr_t lpstub_start = reinterpret_cast<uintptr_t>(&__start_lpstub);

#if defined(__FreeBSD__)
Expand All @@ -196,29 +193,28 @@ struct text_region FindNodeTextRegion() {
#endif // defined(__FreeBSD__)

if (dl_iterate_phdr(FindMapping, &dl_params) == 1) {
Debug("Hugepages info: start: %p - sym: %p - end: %p\n",
Debug("start: %p - sym: %p - end: %p\n",
reinterpret_cast<void*>(dl_params.start),
reinterpret_cast<void*>(dl_params.reference_sym),
reinterpret_cast<void*>(dl_params.end));

dl_params.start = dl_params.reference_sym;
if (lpstub_start > dl_params.start && lpstub_start <= dl_params.end) {
Debug("Hugepages info: Trimming end for lpstub: %p\n",
Debug("Trimming end for lpstub: %p\n",
reinterpret_cast<void*>(lpstub_start));
dl_params.end = lpstub_start;
}

if (dl_params.start < dl_params.end) {
char* from = reinterpret_cast<char*>(hugepage_align_up(dl_params.start));
char* to = reinterpret_cast<char*>(hugepage_align_down(dl_params.end));
Debug("Hugepages info: Aligned range is %p - %p\n", from, to);
Debug("Aligned range is %p - %p\n", from, to);
if (from < to) {
size_t pagecount = (to - from) / hps;
if (pagecount > 0) {
nregion.found_text_region = true;
nregion.from = from;
nregion.to = to;
nregion.total_hugepages = pagecount;
}
}
}
Expand Down Expand Up @@ -249,7 +245,6 @@ struct text_region FindNodeTextRegion() {
nregion.found_text_region = true;
nregion.from = start;
nregion.to = end;
nregion.total_hugepages = esize / hps;
break;
}

Expand All @@ -258,7 +253,7 @@ struct text_region FindNodeTextRegion() {
}
}
#endif
Debug("Hugepages info: Found %d huge pages\n", nregion.total_hugepages);
Debug("Found %d huge pages\n", (nregion.to - nregion.from) / hps);
return nregion;
}

Expand Down