Messages in this thread |  | | | Subject | Re: VM - is "reserved memory for root" possible (in case of a leak)? | | From | FabF <> | | Date | Wed, 07 Jul 2004 10:32:02 +0200 |
On Wed, 2004-07-07 at 09:37, Tomasz Chmielewski wrote: > Hello, > > Short nature of a problem: > > Recently I was playing with Apache2 as a proxy + mod_clamav as a virus > scanner, put some load to it, and in a short time hanged the machine > (actually, it was short of memory, and it stopped to respond - in logs I > saw VM was killing some other processes, unfortunately not Apache). > > As I could reach the machine only remotely, it was no wonder I run into > troubles... > > Sounds familiar? > > > Solution? > > I was thinking, if there is something like: > > "reserved_min_memory_for_root = 10M" > "reserved_min_memory_processes = /usr/sbin/sshd, /usr/sbin/pppd, etc.etc" > > Which would just give that memory for those processes "once and for > all", and thus, saving trouble in case of a memory leak, uncontrolled > process, or similar. > > I know it would be tricky to implement it, because the question arises, > what happens if we have no memory left, and these > "reserved_min_memory_processes" begin to grow? > > But I think it would be something like a comparison: > > ulimit vs this "reserved_min_memory_for_root", and > quota vs -m option from mke2fs. > > Is there something like it already in the kernel? > > > It would be similar to mke2fs for the filesystem: > > # man mke2fs > > -m reserved-blocks-percentage > Specify the percentage of the filesystem blocks reserved > for the > super-user. This value defaults to 5% Hi Tomasz,
Maybe you would want to tune /proc/sys/vm/min_free_kbytes or renice +xx apache.Some vmstat 1 report, uname -a could be interesting as well.There's no per profile VM granularity in 2.6.
Regards, FabF
> > > > Regards, > > Tomasz Chmielewski > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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