Extend memory-info for remote systems

* doc/lispref/files.texi (Magic File Names): Add memory-info.

* doc/lispref/internals.texi (Garbage Collection): memory-info can
also retrieve values from remote systems.

* etc/NEWS: Document changes in memory-info.  Fix typos.

* lisp/files.el (warn-maybe-out-of-memory): Ensure local memory info.

* lisp/net/tramp.el (tramp-handle-memory-info): New defun.
(tramp-file-name-for-operation)
* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-archive.el (tramp-archive-file-name-handler-alist):
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-rclone.el (tramp-rclone-file-name-handler-alist):
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
* lisp/net/tramp-sshfs.el (tramp-sshfs-file-name-handler-alist)
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-file-name-handler-alist):
Add 'memory-info'.

* lisp/net/tramp-sshfs.el (tramp-sshfs-handle-exec-path):
Let-bind `process-file-side-effects'.

* src/alloc.c (Fmemory_info): Support remote systems.
(Qmemory_info): Declare.

* test/lisp/net/tramp-tests.el (tramp-test31-memory-info): New test.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index a79c47be723..6ffb8a65292 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -5388,6 +5388,21 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
       ;; Cleanup.
       (ignore-errors (delete-process proc)))))
 
+(ert-deftest tramp-test31-memory-info ()
+  "Check `memory-info'."
+  :tags '(:expensive-test)
+  (skip-unless (tramp--test-enabled))
+  (skip-unless (tramp--test-supports-processes-p))
+  ;; `memory-info' is supported since Emacs 29.1.
+  (skip-unless (tramp--test-emacs29-p))
+
+  (when-let ((default-directory ert-remote-temporary-file-directory)
+             (mi (memory-info)))
+    (should (consp mi))
+    (should (= (length mi) 4))
+    (dotimes (i (length mi))
+      (should (natnump (nth i mi))))))
+
 (defun tramp--test-async-shell-command
     (command output-buffer &optional error-buffer input)
   "Like `async-shell-command', reading the output.