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[79.227.175.121]) by smtp.gmail.com with ESMTPSA id ev8-20020a056402540800b0057212938dd0sm447728edb.73.2024.04.22.04.05.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Apr 2024 04:05:25 -0700 (PDT) In-Reply-To: <86mspl652g.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 22 Apr 2024 13:54:15 +0300") Received-SPF: pass client-ip=2a00:1450:4864:20::52b; envelope-from=gerd.moellmann@gmail.com; helo=mail-ed1-x52b.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, FREEMAIL_REPLY=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:317975 Archived-At: Eli Zaretskii writes: >> From: Gerd M=C3=B6llmann >> Cc: eggert@cs.ucla.edu, eller.helmut@gmail.com, emacs-devel@gnu.org >> Date: Mon, 22 Apr 2024 12:22:25 +0200 >>=20 >> Eli Zaretskii writes: >>=20 >> > Doesn't copying GC work by copying live objects to a new memory >> > region, and then freeing the old region? If so, if some objects >> > cannot be moved, how can the old region be freed? >>=20 >> Yes. A simple precise GC (no support for ambiguous references) might >> work with 2 regions, which are usually called to-space and froms-space. >> When a GC happens, everything live is copied from from-space to >> to-space. At the end, to-space has all live objects, and both spaces can >> switch roles in the next GC. > > Btw, does this mean that a copying GC will make the memory used for > live objects roughly doubled in size? Yes, exactly. It's a well-known problem.