On Sun, 1 Sep 2024 21:41:27 -0700 Suren Baghdasaryan <sur...@google.com> wrote:
> Introduce CONFIG_PGALLOC_TAG_REF_BITS to control the size of the > page allocation tag references. When the size is configured to be > less than a direct pointer, the tags are searched using an index > stored as the tag reference. > > ... > > +config PGALLOC_TAG_REF_BITS > + int "Number of bits for page allocation tag reference (10-64)" > + range 10 64 > + default "64" > + depends on MEM_ALLOC_PROFILING > + help > + Number of bits used to encode a page allocation tag reference. > + > + Smaller number results in less memory overhead but limits the number > of > + allocations which can be tagged (including allocations from modules). > + In other words, "we have no idea what's best for you, you're on your own". I pity our poor users. Can we at least tell them what they should look at to determine whether whatever random number they chose was helpful or harmful?
