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document tuning vm.max_map_count

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Daniel Micay 2018-10-04 03:44:19 -04:00
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@ -37,6 +37,12 @@ executables using glibc or musl:
./preload.sh krita --new-image RGBA,U8,500,500
It can be necessary to substantially increase the `vm.max_map_count` sysctl to
accomodate the large number of mappings caused by guard slabs and large
allocation guard regions. There will be a configuration option in `config.h`
for tuning the proportion of slabs to guard slabs too, since the default 1:1
proportion makes the address space quite sparse.
It can offer slightly better performance when integrated into the C standard
library and there are other opportunities for similar hardening within C
standard library and dynamic linker implementations. For example, a library