shift)
(ash len shift)))))))
+;;; Access to the GENCGC page table for better precision in
+;;; MAP-ALLOCATED-OBJECTS
+#!+gencgc
+(progn
+ (define-alien-type nil
+ (struct page
+ (flags unsigned-int)
+ (gen int)
+ (bytes-used int)
+ (start long)))
+ (declaim (inline find-page-index))
+ (define-alien-routine "find_page_index" long (index long))
+ (define-alien-variable "page_table"
+ (array (struct page)
+ #.(truncate (- dynamic-space-end
+ dynamic-space-start)
+ sb!vm:gencgc-page-size))))
+
;;; Iterate over all the objects allocated in SPACE, calling FUN with
;;; the object, the object's type code, and the object's total size in
;;; bytes, including any header and padding.
(defun map-allocated-objects (fun space)
(declare (type function fun) (type spaces space))
(without-gcing
- (multiple-value-bind (start end) (space-bounds space)
- (declare (type system-area-pointer start end))
- (declare (optimize (speed 3) (safety 0)))
- (let ((current start)
- #+nil
- (prev nil))
- (loop
- (let* ((header (sap-ref-word current 0))
- (header-widetag (logand header #xFF))
- (info (svref *room-info* header-widetag)))
- (cond
- ((or (not info)
- (eq (room-info-kind info) :lowtag))
- (let ((size (* cons-size n-word-bytes)))
- (funcall fun
- (make-lisp-obj (logior (sap-int current)
- list-pointer-lowtag))
- list-pointer-lowtag
- size)
- (setq current (sap+ current size))))
- ((eql header-widetag closure-header-widetag)
- (let* ((obj (make-lisp-obj (logior (sap-int current)
- fun-pointer-lowtag)))
- (size (round-to-dualword
- (* (the fixnum (1+ (get-closure-length obj)))
- n-word-bytes))))
- (funcall fun obj header-widetag size)
- (setq current (sap+ current size))))
- ((eq (room-info-kind info) :instance)
- (let* ((obj (make-lisp-obj
- (logior (sap-int current) instance-pointer-lowtag)))
- (size (round-to-dualword
- (* (+ (%instance-length obj) 1) n-word-bytes))))
- (declare (fixnum size))
- (funcall fun obj header-widetag size)
- (aver (zerop (logand size lowtag-mask)))
- #+nil
- (when (> size 200000) (break "implausible size, prev ~S" prev))
- #+nil
- (setq prev current)
- (setq current (sap+ current size))))
- (t
- (let* ((obj (make-lisp-obj
- (logior (sap-int current) other-pointer-lowtag)))
- (size (ecase (room-info-kind info)
- (:fixed
- (aver (or (eql (room-info-length info)
+ (multiple-value-bind (start end) (space-bounds space)
+ (declare (type system-area-pointer start end))
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((current start)
+ (skip-tests-until-addr 0))
+ (labels ((maybe-finish-mapping ()
+ (unless (sap< current end)
+ (aver (sap= current end))
+ (return-from map-allocated-objects)))
+ ;; GENCGC doesn't allocate linearly, which means that the
+ ;; dynamic space can contain large blocks zeros that get
+ ;; accounted as conses in ROOM (and slow down other
+ ;; applications of MAP-ALLOCATED-OBJECTS). To fix this
+ ;; check the GC page structure for the current address.
+ ;; If the page is free or the address is beyond the page-
+ ;; internal allocation offset (bytes-used) skip to the
+ ;; next page immediately.
+ (maybe-skip-page ()
+ #!+gencgc
+ (when (eq space :dynamic)
+ (loop with page-mask = #.(1- sb!vm:gencgc-page-size)
+ for addr of-type sb!vm:word = (sap-int current)
+ while (>= addr skip-tests-until-addr)
+ do
+ ;; For some reason binding PAGE with LET
+ ;; conses like mad (but gives no compiler notes...)
+ ;; Work around the problem with SYMBOL-MACROLET
+ ;; instead of trying to figure out the real
+ ;; issue. -- JES, 2005-05-17
+ (symbol-macrolet
+ ((page (deref page-table
+ (find-page-index addr))))
+ ;; Don't we have any nicer way to access C struct
+ ;; bitfields?
+ (let ((alloc-flag (ldb (byte 3 2)
+ (slot page 'flags)))
+ (bytes-used (slot page 'bytes-used)))
+ ;; If the page is not free and the current
+ ;; pointer is still below the allocation offset
+ ;; of the page
+ (when (and (not (zerop alloc-flag))
+ (<= (logand page-mask addr)
+ bytes-used))
+ ;; Don't bother testing again until we
+ ;; get past that allocation offset
+ (setf skip-tests-until-addr
+ (+ (logandc2 addr page-mask)
+ (the fixnum bytes-used)))
+ ;; And then continue with the scheduled
+ ;; mapping
+ (return-from maybe-skip-page))
+ ;; Move CURRENT to start of next page
+ (setf current (int-sap (+ (logandc2 addr page-mask)
+ sb!vm:gencgc-page-size)))
+ (maybe-finish-mapping)))))))
+ (declare (inline maybe-finish-mapping maybe-skip-page))
+ (loop
+ (maybe-finish-mapping)
+ (maybe-skip-page)
+ (let* ((header (sap-ref-word current 0))
+ (header-widetag (logand header #xFF))
+ (info (svref *room-info* header-widetag)))
+ (cond
+ ((or (not info)
+ (eq (room-info-kind info) :lowtag))
+ (let ((size (* cons-size n-word-bytes)))
+ (funcall fun
+ (make-lisp-obj (logior (sap-int current)
+ list-pointer-lowtag))
+ list-pointer-lowtag
+ size)
+ (setq current (sap+ current size))))
+ ((eql header-widetag closure-header-widetag)
+ (let* ((obj (make-lisp-obj (logior (sap-int current)
+ fun-pointer-lowtag)))
+ (size (round-to-dualword
+ (* (the fixnum (1+ (get-closure-length obj)))
+ n-word-bytes))))
+ (funcall fun obj header-widetag size)
+ (setq current (sap+ current size))))
+ ((eq (room-info-kind info) :instance)
+ (let* ((obj (make-lisp-obj
+ (logior (sap-int current) instance-pointer-lowtag)))
+ (size (round-to-dualword
+ (* (+ (%instance-length obj) 1) n-word-bytes))))
+ (declare (fixnum size))
+ (funcall fun obj header-widetag size)
+ (aver (zerop (logand size lowtag-mask)))
+ (setq current (sap+ current size))))
+ (t
+ (let* ((obj (make-lisp-obj
+ (logior (sap-int current) other-pointer-lowtag)))
+ (size (ecase (room-info-kind info)
+ (:fixed
+ (aver (or (eql (room-info-length info)
(1+ (get-header-data obj)))
- (floatp obj)
- (simple-array-nil-p obj)))
- (round-to-dualword
- (* (room-info-length info) n-word-bytes)))
- ((:vector :string)
- (vector-total-size obj info))
- (:header
- (round-to-dualword
- (* (1+ (get-header-data obj)) n-word-bytes)))
- (:code
- (+ (the fixnum
- (* (get-header-data obj) n-word-bytes))
- (round-to-dualword
- (* (the fixnum (%code-code-size obj))
- n-word-bytes)))))))
- (declare (fixnum size))
- (funcall fun obj header-widetag size)
- (aver (zerop (logand size lowtag-mask)))
- #+nil
- (when (> size 200000)
- (break "Implausible size, prev ~S" prev))
- #+nil
- (setq prev current)
- (setq current (sap+ current size))))))
- (unless (sap< current end)
- (aver (sap= current end))
- (return)))
-
- #+nil
- prev))))
+ (floatp obj)
+ (simple-array-nil-p obj)))
+ (round-to-dualword
+ (* (room-info-length info) n-word-bytes)))
+ ((:vector :string)
+ (vector-total-size obj info))
+ (:header
+ (round-to-dualword
+ (* (1+ (get-header-data obj)) n-word-bytes)))
+ (:code
+ (+ (the fixnum
+ (* (get-header-data obj) n-word-bytes))
+ (round-to-dualword
+ (* (the fixnum (%code-code-size obj))
+ n-word-bytes)))))))
+ (declare (fixnum size))
+ (funcall fun obj header-widetag size)
+ (aver (zerop (logand size lowtag-mask)))
+ (setq current (sap+ current size))))))))))))
+
\f
;;;; MEMORY-USAGE
projects / sbcl.git / blobdiff