Hi Duncan, I just discovered that a newly created account doesn't suffer from this warning. So what option in my carefully crafted (kde) configuration could be responsible for plasma/kde not being able to initialize shared memory?
On Wed, Nov 18, 2015 at 8:43 AM, Martin van Es <mrva...@gmail.com> wrote: > Hi Duncan, > > Thx for your lengthy answer. > I'm using Kubuntu Wily with custom built kernel 4.3.0 (but the same > happens when booting the ubuntu kernel). > I don't use apparmor and selinux is disabled according to getenforce. > > I use kubuntu-backports repository, so as for versions, I'm at plasma > 5.4.3, framework 5.15 and apps 15.08.2 > > Best regards, > Martin > > On Wed, Nov 18, 2015 at 2:31 AM, Duncan <1i5t5.dun...@cox.net> wrote: > >> Martin van Es posted on Tue, 17 Nov 2015 12:50:35 +0100 as excerpted: >> >> > Hi, >> > >> > I've searched high and low but couldn't find a satisfactory answer to >> > the question: why do all KDE/Plasma apps warn "Failed to establish >> > shared memory mapping, will fallback to private memory -- memory usage >> > will increase"? >> > >> > I have /dev/shm mounted (tmpfs) and /dev/shm has drwxrwxrwt mode bits, >> > /run/shm is a symbolic link to /dev/shm >> > >> > What I find curious is that when I start the same app as root it doesn't >> > show the warning, but I can't for the life of me understand why I can't >> > establish shared memory as a user and can as root? >> > >> > /dev/shm contains file that have pulse-shm in their name, and ipcs -a >> > shows me many shared memory segments? >> > So why can't KDE apps establish shared memory? >> >> This /may/ be a result of some sort of security measures your distro has >> setup. Unfortunately you didn't mention the distro and version you're >> running, but I've not seen such warnings here, on Gentoo/~amd64. >> >> Also, you didn't mention what version of kde/plasma. With many distros >> switching to kde-frameworks-5 and plasma-5, while others are still on >> kde4, and even where the switch to 5 has taken place, individual apps may >> remain kde4 based for the time being, this could be important, as well. >> >> FWIW, kde4 here, tho I have most of a minimal kde-frameworks-5/plasma-5 >> installed for easier testing, lacking only the few bits that can't be >> installed along with the kde4 versions, so I can keep what's configured >> and working, while quickly switching to the new versions for testing when >> I have time. >> >> As for the warning itself, I don't believe it actually refers to shm. >> >> KDE (at least kde4, and kde3 before it, and I'd guess plasma5 does >> something similar) normally starts up using a special initialization >> sequence that starts one process and then forks several others off it, >> doing it in such a way that they can share the same library (elf *.so >> shared objects) address space, etc, thus allowing shared libraries with >> faster launching and lower memory usage, even where security measures >> such as memory-space randomization would normally force separate >> applications to use their own separately randomized library addresses for >> the same libraries, making it impossible to share the same library >> address space and increasing memory usage. >> >> I'd guess that this isn't working in your case for whatever reason, very >> possibly due to additional security measures taken by your distro. If >> so, it really doesn't have anything to do with tmpfs or /dev/shm and its >> permissions, but rather, with whatever additional security measures your >> distro is enforcing. >> >> -- >> Duncan - List replies preferred. No HTML msgs. >> "Every nonfree program has a lord, a master -- >> and if you use the program, he is your master." Richard Stallman >> >> ___________________________________________________ >> This message is from the kde mailing list. >> Account management: https://mail.kde.org/mailman/listinfo/kde. >> Archives: http://lists.kde.org/. >> More info: http://www.kde.org/faq.html. > > > > > -- > If 'but' was any useful, it would be a logic operator > -- If 'but' was any useful, it would be a logic operator
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