add several extstore options for help info.
@@ -6266,6 +6266,7 @@ static void usage(void) {
#ifdef EXTSTORE
" - ext_path: file to write to for external storage.\n"
" - ext_page_size: size in megabytes of storage pages.\n"
+ " - ext_page_count: total number of storage pages.\n"
" - ext_wbuf_size: size in megabytes of page write buffers.\n"
" - ext_threads: number of IO threads to run.\n"
" - ext_item_size: store items larger than this (bytes)\n"
@@ -6276,6 +6277,7 @@ static void usage(void) {
" - ext_compact_under: compact when fewer than this many free pages\n"
" - ext_drop_under: drop COLD items when fewer than this many free pages\n"
" - ext_max_frag: max page fragmentation to tolerage\n"
+ " - slab_automove_freeratio: ratio of memory to hold free as buffer.\n"
" (see doc/storage.txt for more info)\n"
#endif
);
