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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
c7d03a00b5
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>
41 lines
903 B
C
41 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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