common/MemoryModel: Alpine is a linux variant but does not implement …

…mallinfo(). Added explicit feature check.

Signed-off-by: John Coyle <dx9err@gmail.com>

CMakeLists.txt

@@ -32,6 +32,7 @@ CHECK_FUNCTION_EXISTS(posix_fadvise HAVE_POSIX_FADVISE)
 CHECK_FUNCTION_EXISTS(posix_fallocate HAVE_POSIX_FALLOCATE)
 CHECK_FUNCTION_EXISTS(syncfs HAVE_SYS_SYNCFS) 
 CHECK_FUNCTION_EXISTS(sync_file_range HAVE_SYNC_FILE_RANGE)
+CHECK_FUNCTION_EXISTS(mallinfo HAVE_MALLINFO)
 CHECK_INCLUDE_FILES("arpa/inet.h" HAVE_ARPA_INET_H)
 CHECK_INCLUDE_FILES("boost/random/discrete_distribution.hpp" HAVE_BOOST_RANDOM_DISCRETE_DISTRIBUTION)
 CHECK_INCLUDE_FILES("dirent.h" HAVE_DIRENT_H)

configure.ac

@@ -964,6 +964,10 @@ AC_CHECK_FUNC([fallocate],
 	[AC_DEFINE([CEPH_HAVE_FALLOCATE], [], [fallocate(2) is supported])],
 	[])
 
+# mallinfo
+AC_CHECK_FUNC([mallinfo],
+  [AC_DEFINE(HAVE_MALLINFO, 1, [Define if you have mallinfo])])
+
 # getgrouplist
 AC_CHECK_FUNCS([getgrouplist])
 

src/common/MemoryModel.cc

@@ -1,4 +1,5 @@
 
+#include "acconfig.h"
 #include "include/types.h"
 #include "MemoryModel.h"
 #include "common/config.h"
@@ -92,7 +93,7 @@ void MemoryModel::_sample(snap *psnap)
   psnap->heap = heap >> 10;
 
   // ...
-#if defined(__linux__)
+#if defined(HAVE_MALLINFO)
   struct mallinfo mi = mallinfo();
 
   psnap->malloc = mi.uordblks >> 10;

src/include/config-h.in.cmake

@@ -6,6 +6,9 @@
 /* fallocate(2) is supported */
 #cmakedefine CEPH_HAVE_FALLOCATE 
 
+/* mallinfo(3) is supported */
+#cmakedefine HAVE_MALLINFO
+
 /* posix_fadvise is supported */
 #cmakedefine HAVE_POSIX_FADVISE