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Message-Id: <200911251409.04573.arnd@arndb.de> Date: Wed, 25 Nov 2009 14:09:04 +0100 From: Arnd Bergmann <arnd@...db.de> To: Andi Kleen <andi@...stfloor.org> Cc: Nick Piggin <npiggin@...e.de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [rfc] "fair" rw spinlocks On Wednesday 25 November 2009, Andi Kleen wrote: > > No that's what I meant, the new type would be non nestable. > > Okay. Unfortunately it's still quite a lot of work. > > %git/linux-2.6> gid rwlock_t | wc -l > 221 > > Just tasklist_lock alone would be tough I guess, on level with one of your > nasty VFS locks that protect a thousand different things without any > comments. You missed all the static DEFINE_RWLOCK instances, which are another 130 or so. Fortunately many of them are in the obscure category. Looking only at the files used in a x86 defconfig build, less than 80 remain, mostly networking related. Arnd <>< arch/x86/kernel/amd_iommu.c:static DEFINE_RWLOCK(amd_iommu_devtable_lock); drivers/md/dm.c: rwlock_t map_lock; drivers/md/dm-region-hash.c: rwlock_t hash_lock; drivers/scsi/sg.c: rwlock_t rq_list_lock; /* protect access to list in req_arr */ drivers/scsi/sg.c:static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock fs/binfmt_misc.c:static DEFINE_RWLOCK(entries_lock); fs/exec.c:static DEFINE_RWLOCK(binfmt_lock); fs/fcntl.c:static DEFINE_RWLOCK(fasync_lock); fs/filesystems.c:static DEFINE_RWLOCK(file_systems_lock); fs/proc/kcore.c:static DEFINE_RWLOCK(kclist_lock); include/linux/atalk.h:extern rwlock_t atalk_interfaces_lock; include/linux/atalk.h:extern rwlock_t atalk_routes_lock; include/linux/atalk.h:extern rwlock_t atalk_sockets_lock; include/linux/atmdev.h:extern rwlock_t vcc_sklist_lock; include/linux/fs.h: rwlock_t lock; /* protects pid, uid, euid fields */ include/linux/fs_struct.h: rwlock_t lock; include/linux/inetdevice.h: rwlock_t mc_list_lock; include/linux/leds.h: rwlock_t leddev_list_lock; include/linux/netdevice.h:extern rwlock_t dev_base_lock; /* Device list lock */ include/linux/sched.h:extern rwlock_t tasklist_lock; include/linux/sunrpc/cache.h: rwlock_t hash_lock; include/linux/vmalloc.h:extern rwlock_t vmlist_lock; include/net/act_api.h: rwlock_t *lock; include/net/bluetooth/bluetooth.h: rwlock_t lock; include/net/if_inet6.h: rwlock_t lock; include/net/if_inet6.h: rwlock_t mc_lock; include/net/if_inet6.h: rwlock_t sflock; include/net/inet_frag.h: rwlock_t lock; include/net/ip6_fib.h: rwlock_t tb6_lock; include/net/ip.h:extern rwlock_t ip_ra_lock; include/net/ipv6.h:extern rwlock_t ip6_ra_lock; include/net/ip_vs.h: rwlock_t sched_lock; /* lock sched_data */ include/net/llc.h:extern rwlock_t llc_sap_list_lock; include/net/llc.h: rwlock_t lock; include/net/neighbour.h: rwlock_t lock; include/net/neighbour.h: rwlock_t lock; include/net/netns/packet.h: rwlock_t sklist_lock; include/net/raw.h: rwlock_t lock; include/net/request_sock.h: rwlock_t syn_wait_lock; include/net/sock.h: rwlock_t sk_callback_lock; include/net/sock.h: rwlock_t sk_dst_lock; include/net/xfrm.h: rwlock_t lock; include/sound/core.h: rwlock_t ctl_files_rwlock; /* ctl_files list lock */ include/sound/pcm.h:extern rwlock_t snd_pcm_link_rwlock; kernel/cgroup.c:static DEFINE_RWLOCK(css_set_lock); kernel/exec_domain.c:static DEFINE_RWLOCK(exec_domains_lock); kernel/fork.c:__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ kernel/resource.c:static DEFINE_RWLOCK(resource_lock); mm/vmalloc.c:DEFINE_RWLOCK(vmlist_lock); net/core/dev.c:DEFINE_RWLOCK(dev_base_lock); net/core/gen_estimator.c:static DEFINE_RWLOCK(est_lock); net/core/neighbour.c:static DEFINE_RWLOCK(neigh_tbl_lock); net/core/sock.c:static DEFINE_RWLOCK(proto_list_lock); net/ipv4/fib_hash.c:static DEFINE_RWLOCK(fib_hash_lock); net/ipv4/inetpeer.c:static DEFINE_RWLOCK(peer_pool_lock); net/ipv4/ipmr.c:static DEFINE_RWLOCK(mrt_lock); net/ipv4/ip_sockglue.c:DEFINE_RWLOCK(ip_ra_lock); net/ipv6/addrconf.c:static DEFINE_RWLOCK(addrconf_hash_lock); net/ipv6/anycast.c:static DEFINE_RWLOCK(ipv6_sk_ac_lock); net/ipv6/ip6_fib.c:static DEFINE_RWLOCK(fib6_walker_lock); net/ipv6/ip6_flowlabel.c:static DEFINE_RWLOCK(ip6_fl_lock); net/ipv6/ip6_flowlabel.c:static DEFINE_RWLOCK(ip6_sk_fl_lock); net/ipv6/ipv6_sockglue.c:DEFINE_RWLOCK(ip6_ra_lock); net/ipv6/mcast.c:static DEFINE_RWLOCK(ipv6_sk_mc_lock); net/llc/llc_core.c:DEFINE_RWLOCK(llc_sap_list_lock); net/netfilter/nfnetlink_log.c:static DEFINE_RWLOCK(instances_lock); net/netlink/af_netlink.c:static DEFINE_RWLOCK(nl_table_lock); net/sched/act_api.c:static DEFINE_RWLOCK(act_mod_lock); net/sched/cls_api.c:static DEFINE_RWLOCK(cls_mod_lock); net/sched/ematch.c:static DEFINE_RWLOCK(ematch_mod_lock); net/sched/sch_api.c:static DEFINE_RWLOCK(qdisc_mod_lock); net/xfrm/xfrm_policy.c:static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); net/xfrm/xfrm_policy.c:static DEFINE_RWLOCK(xfrm_policy_lock); net/xfrm/xfrm_state.c:static DEFINE_RWLOCK(xfrm_km_lock); net/xfrm/xfrm_state.c:static DEFINE_RWLOCK(xfrm_state_afinfo_lock); security/keys/keyring.c:static DEFINE_RWLOCK(keyring_name_lock); security/selinux/ss/services.c:static DEFINE_RWLOCK(policy_rwlock); sound/core/pcm_native.c:DEFINE_RWLOCK(snd_pcm_link_rwlock); sound/core/seq/seq_clientmgr.h: rwlock_t ports_lock; sound/core/seq/seq_ports.h: rwlock_t list_lock; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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