70c4180f1c
amount of free memory was close to the point at which we would begin reclaiming pages. Now, we continuously scan the active page queue, regardless of the amount of free memory. Consequently, we are continuously calling pmap_ts_referenced() on active pages. Prior to this change, pmap_ts_referenced() would always demote superpage mappings in order to obtain finer-grained reference information. This made sense because we were coming under memory pressure and would soon have to begin reclaiming pages. Now, however, with continuous scanning of the active page queue, these demotions are taking a toll on performance. For example, on one of my test machines, the running time for the HPCC Random Access benchmark (also known as GUPS) has increased by 54%. To address this problem, I have replaced the demotion with a heuristic for periodically clearing the reference flag on superpage mappings. Reviewed by: kib Approved by: re (glebius) Sponsored by: EMC / Isilon Storage Division |
||
|---|---|---|
| .. | ||
| amd64 | ||
| arm | ||
| boot | ||
| bsm | ||
| cam | ||
| cddl | ||
| compat | ||
| conf | ||
| contrib | ||
| crypto | ||
| ddb | ||
| dev | ||
| fs | ||
| gdb | ||
| geom | ||
| gnu/fs/reiserfs | ||
| i386 | ||
| ia64 | ||
| isa | ||
| kern | ||
| kgssapi | ||
| libkern | ||
| mips | ||
| modules | ||
| net | ||
| net80211 | ||
| netatalk | ||
| netgraph | ||
| netinet | ||
| netinet6 | ||
| netipsec | ||
| netipx | ||
| netnatm | ||
| netpfil | ||
| netsmb | ||
| nfs | ||
| nfsclient | ||
| nfsserver | ||
| nlm | ||
| ofed | ||
| opencrypto | ||
| pc98 | ||
| pci | ||
| powerpc | ||
| rpc | ||
| security | ||
| sparc64 | ||
| sys | ||
| teken | ||
| tools | ||
| ufs | ||
| vm | ||
| x86 | ||
| xdr | ||
| xen | ||
| Makefile | ||