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Hi,
This is a patch to allow shared memory region > 1.4GB
on 2GB x86 Linux 2.2.13+, i.e. near 1.9GB.
It can be activated using:
echo 195887104 > /proc/sys/kernel/task_unmapped_base
By this way the shared libs are mapped before the 192MB
virtual address and the shared memory region can be mapped from
0x0C000000 to 0x80000000.
The patch allows this address (TASK_UNMAPPED_BASE) to be changed
but it can hurt the other processes. So, it must be used carefully (for DB
servers)
I know that this patch is for x86 only. May be there are
other platforms that can benefit from this sysctl.
The applications which use brk()/sbrk() can allocate more memory
using this patch (> 700MB).
It is dangerous to set task_unmapped_base near the 2/3 TASK_SIZE
where the elf loader is mapped, i.e. don't go after 1.3GB on 2GB support.
May be we can restrict this providing another value for
max_task_unmapped_base?
I don't expect this patch to be included in the 2.2
kernel, may be it doesn't look very good but it can be very useful :)
Regards,
Julian Anastasov
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Content-Type: TEXT/PLAIN; charset=US-ASCII; name="unmapped-2213-1.diff"
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Content-ID: <Pine.LNX.4.10.9912101203110.2456@linux.himel.bg>
Content-Description: Patch against 2.2.13
Content-Disposition: attachment; filename="unmapped-2213-1.diff"
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