Date: Fri, 24 Aug 2012 16:57:08 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Alan Cox <alc@rice.edu> Cc: alc@freebsd.org, current@freebsd.org Subject: Re: less aggressive contigmalloc ? Message-ID: <20120824145708.GA16557@onelab2.iet.unipi.it> In-Reply-To: <50371485.1020409@rice.edu> References: <20120822120105.GA63763@onelab2.iet.unipi.it> <CAJUyCcPOte19TJXpCVAskhf%2BDia_Zg5uj6J_idW67rGsOLaZXw@mail.gmail.com> <20120823163145.GA3999@onelab2.iet.unipi.it> <50366398.2070700@rice.edu> <20120823174504.GB4820@onelab2.iet.unipi.it> <50371485.1020409@rice.edu>
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On Fri, Aug 24, 2012 at 12:43:33AM -0500, Alan Cox wrote: > On 08/23/2012 12:45, Luigi Rizzo wrote: > >On Thu, Aug 23, 2012 at 12:08:40PM -0500, Alan Cox wrote: > >... > >>>yes i do see that. > >>> > >>>Maybe less aggressive with M_NOWAIT but still kills processes. > >>Are you compiling world with MALLOC_PRODUCTION? The latest version of > >whatever the default is. But: > > > >>jemalloc uses significantly more memory when debugging options are > >>enabled. This first came up in a thread titled "10-CURRENT and swap > >>usage" back in June. > >> > >>Even at its most aggressive, M_WAITOK, contigmalloc() does not directly > >>kill processes. If process death coincides with the use of > >>contigmalloc(), then it is simply the result of earlier, successful > >>contigmalloc() calls, or for that matter any other physical memory > >>allocation calls, having depleted the pool of free pages to the point > >>that the page daemon runs and invokes vm_pageout_oom(). > >does it mean that those previous allocations relied on memory overbooking ? > > Yes. > > >Is there a way to avoid that, then ? > > I believe that malloc()'s default minimum allocation size is 4MB. You > could reduce that. > > Alternatively, you can enable MALLOC_PRODUCTION. i tried this, and as others mentioned it makes life better and reduces the problem but contigmalloc still triggers random process kills. Thanks for the hints. cheers luigi
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