[RFC PATCH] pile stack and mempool driver (resend)

[Bruce Richardson]

On Sat, Aug 01, 2026 at 06:53:58AM +0000, Morten Brørup wrote:
> Early submission of:
> - some mempool optimizations,
> - a new mempool "pile" driver, and
> - its underlying "pile" stack implementation.
> 
> For community feedback and CI test.
> 
> Needless to say, this must be separated into a series of patches.
> For now, I'm submitting a snapshot of work in progress.
> 
> Some performance numbers from mempool_perf_autotest_2cores, all
> with cache=1024 cores=2 n_keep=32768:
> 
> start performance test (using ring_mp_mc, with cache)
> n_get_bulk= 64 n_put_bulk= 64 constant_n=0 rate_persec= 753985338
> n_get_bulk=256 n_put_bulk=256 constant_n=0 rate_persec= 755805913
> 
> start performance test for lf_stack (with cache)
> n_get_bulk= 64 n_put_bulk= 64 constant_n=0 rate_persec=  29132352
> n_get_bulk=256 n_put_bulk=256 constant_n=0 rate_persec=  29276708
> 
> start performance test for pile (with cache)
> n_get_bulk= 64 n_put_bulk= 64 constant_n=0 rate_persec= 560159479
> n_get_bulk=256 n_put_bulk=256 constant_n=0 rate_persec= 557910933
> 
What about the regular non-LF stack? That would always be my choice for the
default for mempools?

/Bruce