On Wed, Jan 19, 2022 at 03:06:19PM -0800, Song Liu wrote: > > +/* > + * BPF program pack allocator. > + * > + * Most BPF programs are pretty small. Allocating a hole page for each > + * program is sometime a waste. Many small bpf program also adds pressure > + * to instruction TLB. To solve this issue, we introduce a BPF program pack > + * allocator. The prog_pack allocator uses HPAGE_PMD_SIZE page (2MB on x86) > + * to host BPF programs. > + */ > +#define BPF_PROG_PACK_SIZE HPAGE_PMD_SIZE > +#define BPF_PROG_MAX_PACK_PROG_SIZE HPAGE_PMD_SIZE We have a synthetic test with 1M bpf instructions. How did it JIT? Are you saying we were lucky that every BPF insn was JITed to <2 bytes x86? Did I misread the 2MB limit?
