Date: Mon, 06 Aug 2018 03:26:08 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230402] With buildworld, the system can not use swap Message-ID: <bug-230402-227-bTjOzOihiL@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-230402-227@https.bugs.freebsd.org/bugzilla/> References: <bug-230402-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230402 Mark Millard <marklmi26-fbsd@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |marklmi26-fbsd@yahoo.com --- Comment #2 from Mark Millard <marklmi26-fbsd@yahoo.com> --- (In reply to Vladislav V. Prodan from comment #0) Unfortunately, the message: pid 9870 (c++), uid 0, was killed: out of swap space can be misleading: that is not necessarily the actual context. The book "The Design and Implementation of the FreeBSD Operating System" (2nd edition, 2014) states (page labeled 296): QUOTE: The FreeBSD swap-out daemon will not select a runnable processes to swap out. So, if the set of runnable processes do not fit in memory, the machine will effectively deadlock. Current machines have enough memory that this condition usually does not arise. If it does, FreeBSD avoids deadlock by killing the largest process. If the condition begins to arise in normal operation, the 4.4BSD algorithm will need to be restored. END QUOTE. If there were no prior messages like: sentinel kernel: swap_pager_getswapspace(32): failed and tools such as swapinfo or top do not show low swap space avaiable, then it is unlikely that "out of swap space" is a correct wording in the message. The arm list has lots of reports for this for RPI2 and RPI3's (that are also 1 GiByte machines). In many cases this is for head (12.0-CURRENT) but 11.x also shows such issues as I understand. Also frequently UFS (so no ARC memory use, for example). Note: 4.4BSD is from long ago. The potential for the issue is not new. What is new is building modern versions of clang and other llvm materials. -- You are receiving this mail because: You are the assignee for the bug.
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