bufmgr: Use atomic sub for unpinning buffers The prior commit made it legal to modify BufferDesc.state while the buffer header spinlock is held. This allows us to replace the CAS loop inUnpinBufferNoOwner() with an atomic sub. This improves scalability significantly. See the prior commits for more background.
Reviewed-by: Matthias van de Meent <[email protected]> Discussion: https://postgr.es/m/fvfmkr5kk4nyex56ejgxj3uzi63isfxovp2biecb4bspbjrze7@az2pljabhnff Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/5310fac6e0fcb1c7fcefb3446767673f9107328c Modified Files -------------- src/backend/storage/buffer/bufmgr.c | 29 +++-------------------------- 1 file changed, 3 insertions(+), 26 deletions(-)
