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![Alexey Dobriyan](/assets/img/avatar_default.png)
Make struct pernet_operations::id unsigned. There are 2 reasons to do so: 1) This field is really an index into an zero based array and thus is unsigned entity. Using negative value is out-of-bound access by definition. 2) On x86_64 unsigned 32-bit data which are mixed with pointers via array indexing or offsets added or subtracted to pointers are preffered to signed 32-bit data. "int" being used as an array index needs to be sign-extended to 64-bit before being used. void f(long *p, int i) { g(p[i]); } roughly translates to movsx rsi, esi mov rdi, [rsi+...] call g MOVSX is 3 byte instruction which isn't necessary if the variable is unsigned because x86_64 is zero extending by default. Now, there is net_generic() function which, you guessed it right, uses "int" as an array index: static inline void *net_generic(const struct net *net, int id) { ... ptr = ng->ptr[id - 1]; ... } And this function is used a lot, so those sign extensions add up. Patch snipes ~1730 bytes on allyesconfig kernel (without all junk messing with code generation): add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730) Unfortunately some functions actually grow bigger. This is a semmingly random artefact of code generation with register allocator being used differently. gcc decides that some variable needs to live in new r8+ registers and every access now requires REX prefix. Or it is shifted into r12, so [r12+0] addressing mode has to be used which is longer than [r8] However, overall balance is in negative direction: add/remove: 0/0 grow/shrink: 70/598 up/down: 396/-2126 (-1730) function old new delta nfsd4_lock 3886 3959 +73 tipc_link_build_proto_msg 1096 1140 +44 mac80211_hwsim_new_radio 2776 2808 +32 tipc_mon_rcv 1032 1058 +26 svcauth_gss_legacy_init 1413 1429 +16 tipc_bcbase_select_primary 379 392 +13 nfsd4_exchange_id 1247 1260 +13 nfsd4_setclientid_confirm 782 793 +11 ... put_client_renew_locked 494 480 -14 ip_set_sockfn_get 730 716 -14 geneve_sock_add 829 813 -16 nfsd4_sequence_done 721 703 -18 nlmclnt_lookup_host 708 686 -22 nfsd4_lockt 1085 1063 -22 nfs_get_client 1077 1050 -27 tcf_bpf_init 1106 1076 -30 nfsd4_encode_fattr 5997 5930 -67 Total: Before=154856051, After=154854321, chg -0.00% Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
40 lines
903 B
C
40 lines
903 B
C
/*
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* NFS-private data for each "struct net". Accessed with net_generic().
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*/
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#ifndef __NFS_NETNS_H__
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#define __NFS_NETNS_H__
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#include <linux/nfs4.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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struct bl_dev_msg {
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int32_t status;
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uint32_t major, minor;
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};
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struct nfs_net {
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struct cache_detail *nfs_dns_resolve;
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struct rpc_pipe *bl_device_pipe;
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struct bl_dev_msg bl_mount_reply;
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wait_queue_head_t bl_wq;
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struct mutex bl_mutex;
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struct list_head nfs_client_list;
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struct list_head nfs_volume_list;
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#if IS_ENABLED(CONFIG_NFS_V4)
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struct idr cb_ident_idr; /* Protected by nfs_client_lock */
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unsigned short nfs_callback_tcpport;
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unsigned short nfs_callback_tcpport6;
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int cb_users[NFS4_MAX_MINOR_VERSION + 1];
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#endif
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spinlock_t nfs_client_lock;
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ktime_t boot_time;
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_nfsfs;
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#endif
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};
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extern unsigned int nfs_net_id;
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#endif
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