Implement pvalloc replacement

Despite being an obsolete function, pvalloc is still present in GLIBC and should
work correctly when jemalloc replaces libc allocator.

src/jemalloc.c

@@ -3250,6 +3250,49 @@ je_valloc(size_t size) {
 }
 #endif
 
+#ifdef JEMALLOC_OVERRIDE_PVALLOC
+JEMALLOC_EXPORT JEMALLOC_ALLOCATOR JEMALLOC_RESTRICT_RETURN
+void JEMALLOC_NOTHROW *
+JEMALLOC_ATTR(malloc)
+je_pvalloc(size_t size) {
+	void *ret;
+
+	static_opts_t sopts;
+	dynamic_opts_t dopts;
+
+	LOG("core.pvalloc.entry", "size: %zu\n", size);
+
+	static_opts_init(&sopts);
+	dynamic_opts_init(&dopts);
+
+	sopts.null_out_result_on_error = true;
+	sopts.min_alignment = PAGE;
+	sopts.oom_string =
+	    "<jemalloc>: Error allocating aligned memory: out of memory\n";
+	sopts.invalid_alignment_string =
+	    "<jemalloc>: Error allocating aligned memory: invalid alignment\n";
+
+	dopts.result = &ret;
+	dopts.num_items = 1;
+	/*
+	 * This is the only difference from je_valloc - size is rounded up to
+	 * a PAGE multiple.
+	 */
+	dopts.item_size = PAGE_CEILING(size);
+	dopts.alignment = PAGE;
+
+	imalloc(&sopts, &dopts);
+	if (sopts.slow) {
+		uintptr_t args[3] = {size};
+		hook_invoke_alloc(hook_alloc_pvalloc, ret, (uintptr_t)ret,
+		    args);
+	}
+
+	LOG("core.pvalloc.exit", "result: %p\n", ret);
+	return ret;
+}
+#endif
+
 #if defined(JEMALLOC_IS_MALLOC) && defined(JEMALLOC_GLIBC_MALLOC_HOOK)
 /*
  * glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
@@ -3297,6 +3340,9 @@ void *__libc_realloc(void* ptr, size_t size) PREALIAS(je_realloc);
 #    ifdef JEMALLOC_OVERRIDE___LIBC_VALLOC
 void *__libc_valloc(size_t size) PREALIAS(je_valloc);
 #    endif
+#    ifdef JEMALLOC_OVERRIDE___LIBC_PVALLOC
+void *__libc_pvalloc(size_t size) PREALIAS(je_pvalloc);
+#    endif
 #    ifdef JEMALLOC_OVERRIDE___POSIX_MEMALIGN
 int __posix_memalign(void** r, size_t a, size_t s) PREALIAS(je_posix_memalign);
 #    endif