On Apr 25, 2012, at 5:31 AM, jb wrote:
> does OS X kernel share any code with FreeBSD kernel's memory management
> subsystem ?
The simple answer is no. A more complex answer:
% grep -ri freebsd xnu-1699.24.23 | wc -l
520
% grep -ril freebsd xnu-1699.24.23 | sort | uniq
% grep -ril freebsd xnu-1699.24.23 | sort | uniq
~/Downloads
xnu-1699.24.23/EXTERNAL_HEADERS/stdbool.h
xnu-1699.24.23/bsd/bsm/audit.h
xnu-1699.24.23/bsd/bsm/audit_domain.h
xnu-1699.24.23/bsd/bsm/audit_errno.h
xnu-1699.24.23/bsd/bsm/audit_fcntl.h
xnu-1699.24.23/bsd/bsm/audit_kevents.h
xnu-1699.24.23/bsd/crypto/aes/gen/aesopt.h
xnu-1699.24.23/bsd/crypto/blowfish/bf_enc.c
xnu-1699.24.23/bsd/crypto/blowfish/bf_locl.h
xnu-1699.24.23/bsd/crypto/blowfish/bf_pi.h
xnu-1699.24.23/bsd/crypto/blowfish/bf_skey.c
xnu-1699.24.23/bsd/crypto/blowfish/blowfish.h
xnu-1699.24.23/bsd/crypto/cast128/cast128.c
xnu-1699.24.23/bsd/crypto/cast128/cast128.h
xnu-1699.24.23/bsd/crypto/cast128/cast128_subkey.h
xnu-1699.24.23/bsd/crypto/des/des.h
xnu-1699.24.23/bsd/crypto/des/des_ecb.c
xnu-1699.24.23/bsd/crypto/des/des_enc.c
xnu-1699.24.23/bsd/crypto/des/des_locl.h
xnu-1699.24.23/bsd/crypto/des/des_setkey.c
xnu-1699.24.23/bsd/crypto/des/podd.h
xnu-1699.24.23/bsd/crypto/des/sk.h
xnu-1699.24.23/bsd/crypto/des/spr.h
xnu-1699.24.23/bsd/crypto/rc4/rc4.c
xnu-1699.24.23/bsd/crypto/rc4/rc4.h
xnu-1699.24.23/bsd/crypto/sha2/sha2.c
xnu-1699.24.23/bsd/crypto/sha2/sha2.h
xnu-1699.24.23/bsd/dev/dtrace/blist.c
xnu-1699.24.23/bsd/dev/dtrace/blist.h
xnu-1699.24.23/bsd/dev/memdev.c
xnu-1699.24.23/bsd/dev/vn/vn.c
xnu-1699.24.23/bsd/hfs/hfs_lookup.c
xnu-1699.24.23/bsd/hfs/hfscommon/headers/RedBlackTree.h
xnu-1699.24.23/bsd/kern/kern_event.c
xnu-1699.24.23/bsd/kern/kern_mib.c
xnu-1699.24.23/bsd/kern/kern_newsysctl.c
xnu-1699.24.23/bsd/kern/kern_resource.c
xnu-1699.24.23/bsd/kern/makesyscalls.sh
xnu-1699.24.23/bsd/kern/sys_pipe.c
xnu-1699.24.23/bsd/kern/syscalls.master
xnu-1699.24.23/bsd/kern/tty.c
xnu-1699.24.23/bsd/kern/uipc_socket.c
xnu-1699.24.23/bsd/kern/uipc_socket2.c
xnu-1699.24.23/bsd/libkern/strsep.c
xnu-1699.24.23/bsd/man/man2/aio_cancel.2
xnu-1699.24.23/bsd/man/man2/aio_error.2
xnu-1699.24.23/bsd/man/man2/aio_read.2
xnu-1699.24.23/bsd/man/man2/aio_return.2
xnu-1699.24.23/bsd/man/man2/aio_suspend.2
xnu-1699.24.23/bsd/man/man2/aio_write.2
xnu-1699.24.23/bsd/man/man2/audit.2
xnu-1699.24.23/bsd/man/man2/auditctl.2
xnu-1699.24.23/bsd/man/man2/auditon.2
xnu-1699.24.23/bsd/man/man2/getaudit.2
xnu-1699.24.23/bsd/man/man2/getauid.2
xnu-1699.24.23/bsd/man/man2/getdtablesize.2
xnu-1699.24.23/bsd/man/man2/getlcid.2
xnu-1699.24.23/bsd/man/man2/getpgrp.2
xnu-1699.24.23/bsd/man/man2/getsid.2
xnu-1699.24.23/bsd/man/man2/i386_get_ldt.2
xnu-1699.24.23/bsd/man/man2/issetugid.2
xnu-1699.24.23/bsd/man/man2/kqueue.2
xnu-1699.24.23/bsd/man/man2/mmap.2
xnu-1699.24.23/bsd/man/man2/mprotect.2
xnu-1699.24.23/bsd/man/man2/msync.2
xnu-1699.24.23/bsd/man/man2/read.2
xnu-1699.24.23/bsd/man/man2/semctl.2
xnu-1699.24.23/bsd/man/man2/semget.2
xnu-1699.24.23/bsd/man/man2/semop.2
xnu-1699.24.23/bsd/man/man2/sendfile.2
xnu-1699.24.23/bsd/man/man2/setaudit.2
xnu-1699.24.23/bsd/man/man2/setauid.2
xnu-1699.24.23/bsd/man/man2/setlcid.2
xnu-1699.24.23/bsd/man/man2/setregid.2
xnu-1699.24.23/bsd/man/man2/setreuid.2
xnu-1699.24.23/bsd/man/man2/sigaction.2
xnu-1699.24.23/bsd/man/man2/undelete.2
xnu-1699.24.23/bsd/man/man2/utimes.2
xnu-1699.24.23/bsd/man/man2/write.2
xnu-1699.24.23/bsd/man/man3/queue.3
xnu-1699.24.23/bsd/man/man4/aio.4
xnu-1699.24.23/bsd/man/man4/audit.4
xnu-1699.24.23/bsd/man/man4/auditpipe.4
xnu-1699.24.23/bsd/man/man4/bpf.4
xnu-1699.24.23/bsd/man/man4/divert.4
xnu-1699.24.23/bsd/man/man4/dummynet.4
xnu-1699.24.23/bsd/man/man4/faith.4
xnu-1699.24.23/bsd/man/man4/gif.4
xnu-1699.24.23/bsd/man/man4/ifmib.4
xnu-1699.24.23/bsd/man/man4/inet6.4
xnu-1699.24.23/bsd/man/man4/ipfirewall.4
xnu-1699.24.23/bsd/man/man4/ipsec.4
xnu-1699.24.23/bsd/man/man4/stf.4
xnu-1699.24.23/bsd/man/man4/tty.4
xnu-1699.24.23/bsd/man/man9/copy.9
xnu-1699.24.23/bsd/man/man9/fetch.9
xnu-1699.24.23/bsd/man/man9/intro.9
xnu-1699.24.23/bsd/man/man9/store.9
xnu-1699.24.23/bsd/man/man9/style.9
xnu-1699.24.23/bsd/miscfs/devfs/README
xnu-1699.24.23/bsd/miscfs/devfs/devfs.h
xnu-1699.24.23/bsd/miscfs/devfs/devfs_tree.c
xnu-1699.24.23/bsd/miscfs/devfs/devfs_vfsops.c
xnu-1699.24.23/bsd/miscfs/devfs/devfs_vnops.c
xnu-1699.24.23/bsd/miscfs/devfs/devfsdefs.h
xnu-1699.24.23/bsd/net/bpf.c
xnu-1699.24.23/bsd/net/bpf.h
xnu-1699.24.23/bsd/net/bpf_compat.h
xnu-1699.24.23/bsd/net/bpf_filter.c
xnu-1699.24.23/bsd/net/bpfdesc.h
xnu-1699.24.23/bsd/net/bridgestp.c
xnu-1699.24.23/bsd/net/bridgestp.h
xnu-1699.24.23/bsd/net/if.c
xnu-1699.24.23/bsd/net/if.h
xnu-1699.24.23/bsd/net/if_arp.h
xnu-1699.24.23/bsd/net/if_bridge.c
xnu-1699.24.23/bsd/net/if_bridgevar.h
xnu-1699.24.23/bsd/net/if_dl.h
xnu-1699.24.23/bsd/net/if_gif.c
xnu-1699.24.23/bsd/net/if_loop.c
xnu-1699.24.23/bsd/net/if_media.c
xnu-1699.24.23/bsd/net/if_media.h
xnu-1699.24.23/bsd/net/if_mib.c
xnu-1699.24.23/bsd/net/if_mib.h
xnu-1699.24.23/bsd/net/if_ppp.h
xnu-1699.24.23/bsd/net/if_pppvar.h
xnu-1699.24.23/bsd/net/if_stf.c
xnu-1699.24.23/bsd/net/if_types.h
xnu-1699.24.23/bsd/net/if_var.h
xnu-1699.24.23/bsd/net/if_vlan.c
xnu-1699.24.23/bsd/net/if_vlan_var.h
xnu-1699.24.23/bsd/net/iso88025.h
xnu-1699.24.23/bsd/net/net_osdep.h
xnu-1699.24.23/bsd/net/radix.c
xnu-1699.24.23/bsd/net/radix.h
xnu-1699.24.23/bsd/net/raw_usrreq.c
xnu-1699.24.23/bsd/net/route.c
xnu-1699.24.23/bsd/net/route.h
xnu-1699.24.23/bsd/net/rtsock.c
xnu-1699.24.23/bsd/net/slip.h
xnu-1699.24.23/bsd/netat/at_proto.c
xnu-1699.24.23/bsd/netinet/icmp_var.h
xnu-1699.24.23/bsd/netinet/if_ether.h
xnu-1699.24.23/bsd/netinet/igmp.h
xnu-1699.24.23/bsd/netinet/in.c
xnu-1699.24.23/bsd/netinet/in.h
xnu-1699.24.23/bsd/netinet/in_pcb.c
xnu-1699.24.23/bsd/netinet/in_pcb.h
xnu-1699.24.23/bsd/netinet/in_rmx.c
xnu-1699.24.23/bsd/netinet/in_systm.h
xnu-1699.24.23/bsd/netinet/in_var.h
xnu-1699.24.23/bsd/netinet/ip.h
xnu-1699.24.23/bsd/netinet/ip_compat.h
xnu-1699.24.23/bsd/netinet/ip_divert.c
xnu-1699.24.23/bsd/netinet/ip_divert.h
xnu-1699.24.23/bsd/netinet/ip_dummynet.c
xnu-1699.24.23/bsd/netinet/ip_dummynet.h
xnu-1699.24.23/bsd/netinet/ip_encap.c
xnu-1699.24.23/bsd/netinet/ip_fw2.c
xnu-1699.24.23/bsd/netinet/ip_fw2.h
xnu-1699.24.23/bsd/netinet/ip_icmp.h
xnu-1699.24.23/bsd/netinet/ip_id.c
xnu-1699.24.23/bsd/netinet/ip_input.c
xnu-1699.24.23/bsd/netinet/ip_mroute.c
xnu-1699.24.23/bsd/netinet/ip_output.c
xnu-1699.24.23/bsd/netinet/tcp.h
xnu-1699.24.23/bsd/netinet/tcp_cc.h
xnu-1699.24.23/bsd/netinet/tcp_debug.c
xnu-1699.24.23/bsd/netinet/tcp_debug.h
xnu-1699.24.23/bsd/netinet/tcp_fsm.h
xnu-1699.24.23/bsd/netinet/tcp_input.c
xnu-1699.24.23/bsd/netinet/tcp_output.c
xnu-1699.24.23/bsd/netinet/tcp_seq.h
xnu-1699.24.23/bsd/netinet/tcp_subr.c
xnu-1699.24.23/bsd/netinet/tcp_timer.c
xnu-1699.24.23/bsd/netinet/tcp_timer.h
xnu-1699.24.23/bsd/netinet/tcp_usrreq.c
xnu-1699.24.23/bsd/netinet/tcp_var.h
xnu-1699.24.23/bsd/netinet/tcpip.h
xnu-1699.24.23/bsd/netinet/udp_usrreq.c
xnu-1699.24.23/bsd/netinet6/ah.h
xnu-1699.24.23/bsd/netinet6/ah6.h
xnu-1699.24.23/bsd/netinet6/ah_core.c
xnu-1699.24.23/bsd/netinet6/ah_input.c
xnu-1699.24.23/bsd/netinet6/ah_output.c
xnu-1699.24.23/bsd/netinet6/dest6.c
xnu-1699.24.23/bsd/netinet6/esp.h
xnu-1699.24.23/bsd/netinet6/esp6.h
xnu-1699.24.23/bsd/netinet6/esp_core.c
xnu-1699.24.23/bsd/netinet6/esp_input.c
xnu-1699.24.23/bsd/netinet6/esp_output.c
xnu-1699.24.23/bsd/netinet6/esp_rijndael.c
xnu-1699.24.23/bsd/netinet6/esp_rijndael.h
xnu-1699.24.23/bsd/netinet6/frag6.c
xnu-1699.24.23/bsd/netinet6/icmp6.c
xnu-1699.24.23/bsd/netinet6/icmp6.h
xnu-1699.24.23/bsd/netinet6/in6.c
xnu-1699.24.23/bsd/netinet6/in6.h
xnu-1699.24.23/bsd/netinet6/in6_gif.c
xnu-1699.24.23/bsd/netinet6/in6_gif.h
xnu-1699.24.23/bsd/netinet6/in6_ifattach.c
xnu-1699.24.23/bsd/netinet6/in6_proto.c
xnu-1699.24.23/bsd/netinet6/in6_rmx.c
xnu-1699.24.23/bsd/netinet6/in6_src.c
xnu-1699.24.23/bsd/netinet6/in6_var.h
xnu-1699.24.23/bsd/netinet6/ip6.h
xnu-1699.24.23/bsd/netinet6/ip6_ecn.h
xnu-1699.24.23/bsd/netinet6/ip6_forward.c
xnu-1699.24.23/bsd/netinet6/ip6_fw.c
xnu-1699.24.23/bsd/netinet6/ip6_input.c
xnu-1699.24.23/bsd/netinet6/ip6_mroute.c
xnu-1699.24.23/bsd/netinet6/ip6_mroute.h
xnu-1699.24.23/bsd/netinet6/ip6_output.c
xnu-1699.24.23/bsd/netinet6/ip6_var.h
xnu-1699.24.23/bsd/netinet6/ip6protosw.h
xnu-1699.24.23/bsd/netinet6/ipcomp.h
xnu-1699.24.23/bsd/netinet6/ipcomp6.h
xnu-1699.24.23/bsd/netinet6/ipcomp_core.c
xnu-1699.24.23/bsd/netinet6/ipcomp_input.c
xnu-1699.24.23/bsd/netinet6/ipcomp_output.c
xnu-1699.24.23/bsd/netinet6/ipsec.c
xnu-1699.24.23/bsd/netinet6/ipsec.h
xnu-1699.24.23/bsd/netinet6/ipsec6.h
xnu-1699.24.23/bsd/netinet6/mld6.h
xnu-1699.24.23/bsd/netinet6/mld6_var.h
xnu-1699.24.23/bsd/netinet6/nd6.c
xnu-1699.24.23/bsd/netinet6/nd6.h
xnu-1699.24.23/bsd/netinet6/nd6_nbr.c
xnu-1699.24.23/bsd/netinet6/nd6_rtr.c
xnu-1699.24.23/bsd/netinet6/pim6.h
xnu-1699.24.23/bsd/netinet6/pim6_var.h
xnu-1699.24.23/bsd/netinet6/raw_ip6.c
xnu-1699.24.23/bsd/netinet6/raw_ip6.h
xnu-1699.24.23/bsd/netinet6/route6.c
xnu-1699.24.23/bsd/netinet6/scope6.c
xnu-1699.24.23/bsd/netinet6/scope6_var.h
xnu-1699.24.23/bsd/netinet6/tcp6_var.h
xnu-1699.24.23/bsd/netinet6/udp6_output.c
xnu-1699.24.23/bsd/netinet6/udp6_usrreq.c
xnu-1699.24.23/bsd/netkey/key.c
xnu-1699.24.23/bsd/netkey/key_debug.c
xnu-1699.24.23/bsd/netkey/keysock.c
xnu-1699.24.23/bsd/nfs/nfs.h
xnu-1699.24.23/bsd/nfs/nfs_bio.c
xnu-1699.24.23/bsd/nfs/nfs_lock.h
xnu-1699.24.23/bsd/nfs/nfs_node.c
xnu-1699.24.23/bsd/nfs/nfs_serv.c
xnu-1699.24.23/bsd/nfs/nfs_socket.c
xnu-1699.24.23/bsd/nfs/nfs_srvcache.c
xnu-1699.24.23/bsd/nfs/nfs_subs.c
xnu-1699.24.23/bsd/nfs/nfs_syscalls.c
xnu-1699.24.23/bsd/nfs/nfs_vfsops.c
xnu-1699.24.23/bsd/nfs/nfs_vnops.c
xnu-1699.24.23/bsd/nfs/nfsdiskless.h
xnu-1699.24.23/bsd/nfs/nfsm_subs.h
xnu-1699.24.23/bsd/nfs/nfsmount.h
xnu-1699.24.23/bsd/nfs/nfsnode.h
xnu-1699.24.23/bsd/nfs/nfsproto.h
xnu-1699.24.23/bsd/nfs/nfsrvcache.h
xnu-1699.24.23/bsd/nfs/rpcv2.h
xnu-1699.24.23/bsd/nfs/xdr_subs.h
xnu-1699.24.23/bsd/security/audit/audit.c
xnu-1699.24.23/bsd/security/audit/audit_bsm_klib.c
xnu-1699.24.23/bsd/sys/domain.h
xnu-1699.24.23/bsd/sys/event.h
xnu-1699.24.23/bsd/sys/eventvar.h
xnu-1699.24.23/bsd/sys/linker_set.h
xnu-1699.24.23/bsd/sys/lockf.h
xnu-1699.24.23/bsd/sys/mbuf.h
xnu-1699.24.23/bsd/sys/pipe.h
xnu-1699.24.23/bsd/sys/poll.h
xnu-1699.24.23/bsd/sys/priv.h
xnu-1699.24.23/bsd/sys/protosw.h
xnu-1699.24.23/bsd/sys/queue.h
xnu-1699.24.23/bsd/sys/sbuf.h
xnu-1699.24.23/bsd/sys/socket.h
xnu-1699.24.23/bsd/sys/socketvar.h
xnu-1699.24.23/bsd/sys/stat.h
xnu-1699.24.23/bsd/sys/syslog.h
xnu-1699.24.23/bsd/sys/time.h
xnu-1699.24.23/bsd/sys/vnioctl.h
xnu-1699.24.23/bsd/vfs/vfs_cache.c
xnu-1699.24.23/security/_label.h
xnu-1699.24.23/security/conf/copyright.nai
xnu-1699.24.23/security/mac.h
xnu-1699.24.23/security/mac_audit.c
xnu-1699.24.23/security/mac_base.c
xnu-1699.24.23/security/mac_file.c
xnu-1699.24.23/security/mac_framework.h
xnu-1699.24.23/security/mac_inet.c
xnu-1699.24.23/security/mac_internal.h
xnu-1699.24.23/security/mac_label.c
xnu-1699.24.23/security/mac_net.c
xnu-1699.24.23/security/mac_pipe.c
xnu-1699.24.23/security/mac_policy.h
xnu-1699.24.23/security/mac_port.c
xnu-1699.24.23/security/mac_posix_sem.c
xnu-1699.24.23/security/mac_posix_shm.c
xnu-1699.24.23/security/mac_process.c
xnu-1699.24.23/security/mac_socket.c
xnu-1699.24.23/security/mac_system.c
xnu-1699.24.23/security/mac_sysv_msg.c
xnu-1699.24.23/security/mac_sysv_sem.c
xnu-1699.24.23/security/mac_sysv_shm.c
xnu-1699.24.23/security/mac_task.c
xnu-1699.24.23/security/mac_vfs.c
> Something is deeply broken in OS X memory management
> http://workstuff.tumblr.com/post/20464780085/something-is-deeply-broken-in-os-x-
> memory-management
Hmm. Certainly it is true that things like mds and the Safari Web Content are
rather memory hungry, and having mds generating initial indexes or doing a big
update will slow down Time Machine due to disk I/O contention.
Flushing the inactive pages and blowing away disk caching can help performance
of a foreground task at the expense of background tasks, but tuning for overall
throughput and avoiding deadlock / livelock is probably a wiser design decision
than concentrating purely on foreground tasks.
Killing off the VM pager is extreme: most folks prefer a program to continue to
run rather than crash, although the latter behavior is also a sign that the
program itself is not well-written.
> One of the problems that caught my eyes was inactive memory reclamation.
> I remember some time ago there was a thread here with similar topic.
> http://lists.freebsd.org/pipermail/freebsd-questions/2012-March/239121.html
Yes. Understanding VM takes a fair amount of background knowledge and making
useful comparisons (ie, testable, repeatable, etc) involves gathering data.
Filing good bug reports with data and reproducible test cases helps problems
get resolved.
Regards,
--
-Chuck
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