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Thu, 12 Feb 2026 16:44:25 +0000 (UTC) Received: from f42-zbm-amd (unknown [10.22.88.16]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 993D319560B9; Thu, 12 Feb 2026 16:44:23 +0000 (UTC) Date: Thu, 12 Feb 2026 09:44:21 -0700 From: Kevin Buettner To: Andrew Burgess Cc: gdb-patches@sourceware.org, Eli Zaretskii , Tom Tromey Subject: Re: [PATCH RFC 1/2] Remove "readnow" support Message-ID: <20260212094421.254dbd66@f42-zbm-amd> In-Reply-To: <87h5rmay3z.fsf@redhat.com> References: <20260211-nuke-readnow-v1-0-7eed7148eec6@tromey.com> <20260211-nuke-readnow-v1-1-7eed7148eec6@tromey.com> <86qzqqtn80.fsf@gnu.org> <87h5rmay3z.fsf@redhat.com> Organization: Red Hat MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: GiXPXrIax8WI7UO_xw2lTMDUThPvhMcs8HJUOOen3HA_1770914665 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org On Thu, 12 Feb 2026 13:29:52 +0000 Andrew Burgess wrote: > Eli Zaretskii writes: > > >> From: Tom Tromey > >> Date: Wed, 11 Feb 2026 11:49:09 -0700 > >> Cc: Tom Tromey > >> > >> I think the "readnow" feature should be removed. > >> > >> "readnow" exists basically to work around potential bugs in any > >> "partial" reader. This used to work ok because gdb would scan all the > >> expanded symtabs in addition to using the "quick" functions. This > >> changed with the "search via psyms" series. > >> > >> So now, "readnow" is basically its own separate implementation. As > >> such, I don't think it carries its weight. It is very slow and uses a > >> lot of memory, and can have its own bugs requiring extra work on our > >> part. > > > > Is there any other way for the user to force GDB to read all of the > > symbols from all of the object files? If not, perhaps this > > functionality still has its value? Maybe we should make it a "maint" > > command instead? > > I second this. We do run into bugs with the indexes from time to time, > and it's good to have some way to tell GDB to go read the full debug > information so we can narrow the bug down. Plus it offers a work around > in these cases. > > Is 'maint expand-symtabs' the equivalent? When someone uses -readnow > should we maybe guide them towards the new way of doing things, even all > we do is point towards a particular entry in the manual maybe? +1