Release 4.8 net/ipv4/inetpeer.c
/*
* INETPEER - A storage for permanent information about peers
*
* This source is covered by the GNU GPL, the same as all kernel sources.
*
* Authors: Andrey V. Savochkin <saw@msu.ru>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/random.h>
#include <linux/timer.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/workqueue.h>
#include <net/ip.h>
#include <net/inetpeer.h>
#include <net/secure_seq.h>
/*
* Theory of operations.
* We keep one entry for each peer IP address. The nodes contains long-living
* information about the peer which doesn't depend on routes.
*
* Nodes are removed only when reference counter goes to 0.
* When it's happened the node may be removed when a sufficient amount of
* time has been passed since its last use. The less-recently-used entry can
* also be removed if the pool is overloaded i.e. if the total amount of
* entries is greater-or-equal than the threshold.
*
* Node pool is organised as an AVL tree.
* Such an implementation has been chosen not just for fun. It's a way to
* prevent easy and efficient DoS attacks by creating hash collisions. A huge
* amount of long living nodes in a single hash slot would significantly delay
* lookups performed with disabled BHs.
*
* Serialisation issues.
* 1. Nodes may appear in the tree only with the pool lock held.
* 2. Nodes may disappear from the tree only with the pool lock held
* AND reference count being 0.
* 3. Global variable peer_total is modified under the pool lock.
* 4. struct inet_peer fields modification:
* avl_left, avl_right, avl_parent, avl_height: pool lock
* refcnt: atomically against modifications on other CPU;
* usually under some other lock to prevent node disappearing
* daddr: unchangeable
*/
static struct kmem_cache *peer_cachep __read_mostly;
static LIST_HEAD(gc_list);
static const int gc_delay = 60 * HZ;
static struct delayed_work gc_work;
static DEFINE_SPINLOCK(gc_lock);
#define node_height(x) x->avl_height
#define peer_avl_empty ((struct inet_peer *)&peer_fake_node)
#define peer_avl_empty_rcu ((struct inet_peer __rcu __force *)&peer_fake_node)
static const struct inet_peer peer_fake_node = {
.avl_left = peer_avl_empty_rcu,
.avl_right = peer_avl_empty_rcu,
.avl_height = 0
};
void inet_peer_base_init(struct inet_peer_base *bp)
{
bp->root = peer_avl_empty_rcu;
seqlock_init(&bp->lock);
bp->total = 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 24 | 80.00% | 1 | 33.33% |
| eric dumazet | eric dumazet | 4 | 13.33% | 1 | 33.33% |
| pre-git | pre-git | 2 | 6.67% | 1 | 33.33% |
| Total | 30 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(inet_peer_base_init);
#define PEER_MAXDEPTH 40
/* sufficient for about 2^27 nodes */
/* Exported for sysctl_net_ipv4. */
int inet_peer_threshold __read_mostly = 65536 + 128;
/* start to throw entries more
* aggressively at this stage */
int inet_peer_minttl __read_mostly = 120 * HZ;
/* TTL under high load: 120 sec */
int inet_peer_maxttl __read_mostly = 10 * 60 * HZ;
/* usual time to live: 10 min */
static void inetpeer_gc_worker(struct work_struct *work)
{
struct inet_peer *p, *n, *c;
struct list_head list;
spin_lock_bh(&gc_lock);
list_replace_init(&gc_list, &list);
spin_unlock_bh(&gc_lock);
if (list_empty(&list))
return;
list_for_each_entry_safe(p, n, &list, gc_list) {
if (need_resched())
cond_resched();
c = rcu_dereference_protected(p->avl_left, 1);
if (c != peer_avl_empty) {
list_add_tail(&c->gc_list, &list);
p->avl_left = peer_avl_empty_rcu;
}
c = rcu_dereference_protected(p->avl_right, 1);
if (c != peer_avl_empty) {
list_add_tail(&c->gc_list, &list);
p->avl_right = peer_avl_empty_rcu;
}
n = list_entry(p->gc_list.next, struct inet_peer, gc_list);
if (!atomic_read(&p->refcnt)) {
list_del(&p->gc_list);
kmem_cache_free(peer_cachep, p);
}
}
if (list_empty(&list))
return;
spin_lock_bh(&gc_lock);
list_splice(&list, &gc_list);
spin_unlock_bh(&gc_lock);
schedule_delayed_work(&gc_work, gc_delay);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| steffen klassert | steffen klassert | 198 | 86.09% | 1 | 33.33% |
| eric dumazet | eric dumazet | 29 | 12.61% | 1 | 33.33% |
| xiao jin | xiao jin | 3 | 1.30% | 1 | 33.33% |
| Total | 230 | 100.00% | 3 | 100.00% |
/* Called from ip_output.c:ip_init */
void __init inet_initpeers(void)
{
struct sysinfo si;
/* Use the straight interface to information about memory. */
si_meminfo(&si);
/* The values below were suggested by Alexey Kuznetsov
* <kuznet@ms2.inr.ac.ru>. I don't have any opinion about the values
* myself. --SAW
*/
if (si.totalram <= (32768*1024)/PAGE_SIZE)
inet_peer_threshold >>= 1; /* max pool size about 1MB on IA32 */
if (si.totalram <= (16384*1024)/PAGE_SIZE)
inet_peer_threshold >>= 1; /* about 512KB */
if (si.totalram <= (8192*1024)/PAGE_SIZE)
inet_peer_threshold >>= 2; /* about 128KB */
peer_cachep = kmem_cache_create("inet_peer_cache",
sizeof(struct inet_peer),
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
NULL);
INIT_DEFERRABLE_WORK(&gc_work, inetpeer_gc_worker);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 83 | 78.30% | 1 | 16.67% |
| linus torvalds | linus torvalds | 12 | 11.32% | 1 | 16.67% |
| steffen klassert | steffen klassert | 7 | 6.60% | 1 | 16.67% |
| eric dumazet | eric dumazet | 2 | 1.89% | 1 | 16.67% |
| alexey dobriyan | alexey dobriyan | 1 | 0.94% | 1 | 16.67% |
| tejun heo | tejun heo | 1 | 0.94% | 1 | 16.67% |
| Total | 106 | 100.00% | 6 | 100.00% |
#define rcu_deref_locked(X, BASE) \
rcu_dereference_protected(X, lockdep_is_held(&(BASE)->lock.lock))
/*
* Called with local BH disabled and the pool lock held.
*/
#define lookup(_daddr, _stack, _base) \
({ \
struct inet_peer *u; \
struct inet_peer __rcu **v; \
\
stackptr = _stack; \
*stackptr++ = &_base->root; \
for (u = rcu_deref_locked(_base->root, _base); \
u != peer_avl_empty;) { \
int cmp = inetpeer_addr_cmp(_daddr, &u->daddr); \
if (cmp == 0) \
break; \
if (cmp == -1) \
v = &u->avl_left; \
else \
v = &u->avl_right; \
*stackptr++ = v; \
u = rcu_deref_locked(*v, _base); \
} \
u; \
})
/*
* Called with rcu_read_lock()
* Because we hold no lock against a writer, its quite possible we fall
* in an endless loop.
* But every pointer we follow is guaranteed to be valid thanks to RCU.
* We exit from this function if number of links exceeds PEER_MAXDEPTH
*/
static struct inet_peer *lookup_rcu(const struct inetpeer_addr *daddr,
struct inet_peer_base *base)
{
struct inet_peer *u = rcu_dereference(base->root);
int count = 0;
while (u != peer_avl_empty) {
int cmp = inetpeer_addr_cmp(daddr, &u->daddr);
if (cmp == 0) {
/* Before taking a reference, check if this entry was
* deleted (refcnt=-1)
*/
if (!atomic_add_unless(&u->refcnt, 1, -1))
u = NULL;
return u;
}
if (cmp == -1)
u = rcu_dereference(u->avl_left);
else
u = rcu_dereference(u->avl_right);
if (unlikely(++count == PEER_MAXDEPTH))
break;
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 95 | 73.64% | 3 | 33.33% |
| david s. miller | david s. miller | 33 | 25.58% | 5 | 55.56% |
| david ahern | david ahern | 1 | 0.78% | 1 | 11.11% |
| Total | 129 | 100.00% | 9 | 100.00% |
/* Called with local BH disabled and the pool lock held. */
#define lookup_rightempty(start, base) \
({ \
struct inet_peer *u; \
struct inet_peer __rcu **v; \
*stackptr++ = &start->avl_left; \
v = &start->avl_left; \
for (u = rcu_deref_locked(*v, base); \
u->avl_right != peer_avl_empty_rcu;) { \
v = &u->avl_right; \
*stackptr++ = v; \
u = rcu_deref_locked(*v, base); \
} \
u; \
})
/* Called with local BH disabled and the pool lock held.
* Variable names are the proof of operation correctness.
* Look into mm/map_avl.c for more detail description of the ideas.
*/
static void peer_avl_rebalance(struct inet_peer __rcu **stack[],
struct inet_peer __rcu ***stackend,
struct inet_peer_base *base)
{
struct inet_peer __rcu **nodep;
struct inet_peer *node, *l, *r;
int lh, rh;
while (stackend > stack) {
nodep = *--stackend;
node = rcu_deref_locked(*nodep, base);
l = rcu_deref_locked(node->avl_left, base);
r = rcu_deref_locked(node->avl_right, base);
lh = node_height(l);
rh = node_height(r);
if (lh > rh + 1) { /* l: RH+2 */
struct inet_peer *ll, *lr, *lrl, *lrr;
int lrh;
ll = rcu_deref_locked(l->avl_left, base);
lr = rcu_deref_locked(l->avl_right, base);
lrh = node_height(lr);
if (lrh <= node_height(ll)) { /* ll: RH+1 */
RCU_INIT_POINTER(node->avl_left, lr); /* lr: RH or RH+1 */
RCU_INIT_POINTER(node->avl_right, r); /* r: RH */
node->avl_height = lrh + 1; /* RH+1 or RH+2 */
RCU_INIT_POINTER(l->avl_left, ll); /* ll: RH+1 */
RCU_INIT_POINTER(l->avl_right, node); /* node: RH+1 or RH+2 */
l->avl_height = node->avl_height + 1;
RCU_INIT_POINTER(*nodep, l);
} else { /* ll: RH, lr: RH+1 */
lrl = rcu_deref_locked(lr->avl_left, base);/* lrl: RH or RH-1 */
lrr = rcu_deref_locked(lr->avl_right, base);/* lrr: RH or RH-1 */
RCU_INIT_POINTER(node->avl_left, lrr); /* lrr: RH or RH-1 */
RCU_INIT_POINTER(node->avl_right, r); /* r: RH */
node->avl_height = rh + 1; /* node: RH+1 */
RCU_INIT_POINTER(l->avl_left, ll); /* ll: RH */
RCU_INIT_POINTER(l->avl_right, lrl); /* lrl: RH or RH-1 */
l->avl_height = rh + 1; /* l: RH+1 */
RCU_INIT_POINTER(lr->avl_left, l); /* l: RH+1 */
RCU_INIT_POINTER(lr->avl_right, node); /* node: RH+1 */
lr->avl_height = rh + 2;
RCU_INIT_POINTER(*nodep, lr);
}
} else if (rh > lh + 1) { /* r: LH+2 */
struct inet_peer *rr, *rl, *rlr, *rll;
int rlh;
rr = rcu_deref_locked(r->avl_right, base);
rl = rcu_deref_locked(r->avl_left, base);
rlh = node_height(rl);
if (rlh <= node_height(rr)) { /* rr: LH+1 */
RCU_INIT_POINTER(node->avl_right, rl); /* rl: LH or LH+1 */
RCU_INIT_POINTER(node->avl_left, l); /* l: LH */
node->avl_height = rlh + 1; /* LH+1 or LH+2 */
RCU_INIT_POINTER(r->avl_right, rr); /* rr: LH+1 */
RCU_INIT_POINTER(r->avl_left, node); /* node: LH+1 or LH+2 */
r->avl_height = node->avl_height + 1;
RCU_INIT_POINTER(*nodep, r);
} else { /* rr: RH, rl: RH+1 */
rlr = rcu_deref_locked(rl->avl_right, base);/* rlr: LH or LH-1 */
rll = rcu_deref_locked(rl->avl_left, base);/* rll: LH or LH-1 */
RCU_INIT_POINTER(node->avl_right, rll); /* rll: LH or LH-1 */
RCU_INIT_POINTER(node->avl_left, l); /* l: LH */
node->avl_height = lh + 1; /* node: LH+1 */
RCU_INIT_POINTER(r->avl_right, rr); /* rr: LH */
RCU_INIT_POINTER(r->avl_left, rlr); /* rlr: LH or LH-1 */
r->avl_height = lh + 1; /* r: LH+1 */
RCU_INIT_POINTER(rl->avl_right, r); /* r: LH+1 */
RCU_INIT_POINTER(rl->avl_left, node); /* node: LH+1 */
rl->avl_height = lh + 2;
RCU_INIT_POINTER(*nodep, rl);
}
} else {
node->avl_height = (lh > rh ? lh : rh) + 1;
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 484 | 74.92% | 1 | 25.00% |
| eric dumazet | eric dumazet | 146 | 22.60% | 2 | 50.00% |
| david s. miller | david s. miller | 16 | 2.48% | 1 | 25.00% |
| Total | 646 | 100.00% | 4 | 100.00% |
/* Called with local BH disabled and the pool lock held. */
#define link_to_pool(n, base) \
do { \
n->avl_height = 1; \
n->avl_left = peer_avl_empty_rcu; \
n->avl_right = peer_avl_empty_rcu; \
/* lockless readers can catch us now */ \
rcu_assign_pointer(**--stackptr, n); \
peer_avl_rebalance(stack, stackptr, base); \
} while (0)
static void inetpeer_free_rcu(struct rcu_head *head)
{
kmem_cache_free(peer_cachep, container_of(head, struct inet_peer, rcu));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 26 | 100.00% | 1 | 100.00% |
| Total | 26 | 100.00% | 1 | 100.00% |
static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base,
struct inet_peer __rcu **stack[PEER_MAXDEPTH])
{
struct inet_peer __rcu ***stackptr, ***delp;
if (lookup(&p->daddr, stack, base) != p)
BUG();
delp = stackptr - 1; /* *delp[0] == p */
if (p->avl_left == peer_avl_empty_rcu) {
*delp[0] = p->avl_right;
--stackptr;
} else {
/* look for a node to insert instead of p */
struct inet_peer *t;
t = lookup_rightempty(p, base);
BUG_ON(rcu_deref_locked(*stackptr[-1], base) != t);
**--stackptr = t->avl_left;
/* t is removed, t->daddr > x->daddr for any
* x in p->avl_left subtree.
* Put t in the old place of p. */
RCU_INIT_POINTER(*delp[0], t);
t->avl_left = p->avl_left;
t->avl_right = p->avl_right;
t->avl_height = p->avl_height;
BUG_ON(delp[1] != &p->avl_left);
delp[1] = &t->avl_left; /* was &p->avl_left */
}
peer_avl_rebalance(stack, stackptr, base);
base->total--;
call_rcu(&p->rcu, inetpeer_free_rcu);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 164 | 75.93% | 1 | 7.69% |
| eric dumazet | eric dumazet | 30 | 13.89% | 8 | 61.54% |
| david s. miller | david s. miller | 16 | 7.41% | 3 | 23.08% |
| kris katterjohn | kris katterjohn | 6 | 2.78% | 1 | 7.69% |
| Total | 216 | 100.00% | 13 | 100.00% |
/* perform garbage collect on all items stacked during a lookup */
static int inet_peer_gc(struct inet_peer_base *base,
struct inet_peer __rcu **stack[PEER_MAXDEPTH],
struct inet_peer __rcu ***stackptr)
{
struct inet_peer *p, *gchead = NULL;
__u32 delta, ttl;
int cnt = 0;
if (base->total >= inet_peer_threshold)
ttl = 0; /* be aggressive */
else
ttl = inet_peer_maxttl
- (inet_peer_maxttl - inet_peer_minttl) / HZ *
base->total / inet_peer_threshold * HZ;
stackptr--; /* last stack slot is peer_avl_empty */
while (stackptr > stack) {
stackptr--;
p = rcu_deref_locked(**stackptr, base);
if (atomic_read(&p->refcnt) == 0) {
smp_rmb();
delta = (__u32)jiffies - p->dtime;
if (delta >= ttl &&
atomic_cmpxchg(&p->refcnt, 0, -1) == 0) {
p->gc_next = gchead;
gchead = p;
}
}
}
while ((p = gchead) != NULL) {
gchead = p->gc_next;
cnt++;
unlink_from_pool(p, base, stack);
}
return cnt;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 157 | 77.34% | 4 | 57.14% |
| pre-git | pre-git | 34 | 16.75% | 1 | 14.29% |
| pavel emelianov | pavel emelianov | 11 | 5.42% | 1 | 14.29% |
| david s. miller | david s. miller | 1 | 0.49% | 1 | 14.29% |
| Total | 203 | 100.00% | 7 | 100.00% |
struct inet_peer *inet_getpeer(struct inet_peer_base *base,
const struct inetpeer_addr *daddr,
int create)
{
struct inet_peer __rcu **stack[PEER_MAXDEPTH], ***stackptr;
struct inet_peer *p;
unsigned int sequence;
int invalidated, gccnt = 0;
/* Attempt a lockless lookup first.
* Because of a concurrent writer, we might not find an existing entry.
*/
rcu_read_lock();
sequence = read_seqbegin(&base->lock);
p = lookup_rcu(daddr, base);
invalidated = read_seqretry(&base->lock, sequence);
rcu_read_unlock();
if (p)
return p;
/* If no writer did a change during our lookup, we can return early. */
if (!create && !invalidated)
return NULL;
/* retry an exact lookup, taking the lock before.
* At least, nodes should be hot in our cache.
*/
write_seqlock_bh(&base->lock);
relookup:
p = lookup(daddr, stack, base);
if (p != peer_avl_empty) {
atomic_inc(&p->refcnt);
write_sequnlock_bh(&base->lock);
return p;
}
if (!gccnt) {
gccnt = inet_peer_gc(base, stack, stackptr);
if (gccnt && create)
goto relookup;
}
p = create ? kmem_cache_alloc(peer_cachep, GFP_ATOMIC) : NULL;
if (p) {
p->daddr = *daddr;
atomic_set(&p->refcnt, 1);
atomic_set(&p->rid, 0);
p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
p->rate_tokens = 0;
/* 60*HZ is arbitrary, but chosen enough high so that the first
* calculation of tokens is at its maximum.
*/
p->rate_last = jiffies - 60*HZ;
INIT_LIST_HEAD(&p->gc_list);
/* Link the node. */
link_to_pool(p, base);
base->total++;
}
write_sequnlock_bh(&base->lock);
return p;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 122 | 41.92% | 8 | 36.36% |
| pre-git | pre-git | 93 | 31.96% | 1 | 4.55% |
| david s. miller | david s. miller | 49 | 16.84% | 8 | 36.36% |
| herbert xu | herbert xu | 9 | 3.09% | 1 | 4.55% |
| steffen klassert | steffen klassert | 8 | 2.75% | 1 | 4.55% |
| nicolas dichtel | nicolas dichtel | 6 | 2.06% | 1 | 4.55% |
| gao feng | gao feng | 3 | 1.03% | 1 | 4.55% |
| pavel emelianov | pavel emelianov | 1 | 0.34% | 1 | 4.55% |
| Total | 291 | 100.00% | 22 | 100.00% |
EXPORT_SYMBOL_GPL(inet_getpeer);
void inet_putpeer(struct inet_peer *p)
{
p->dtime = (__u32)jiffies;
smp_mb__before_atomic();
atomic_dec(&p->refcnt);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 29 | 96.67% | 3 | 75.00% |
| peter zijlstra | peter zijlstra | 1 | 3.33% | 1 | 25.00% |
| Total | 30 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(inet_putpeer);
/*
* Check transmit rate limitation for given message.
* The rate information is held in the inet_peer entries now.
* This function is generic and could be used for other purposes
* too. It uses a Token bucket filter as suggested by Alexey Kuznetsov.
*
* Note that the same inet_peer fields are modified by functions in
* route.c too, but these work for packet destinations while xrlim_allow
* works for icmp destinations. This means the rate limiting information
* for one "ip object" is shared - and these ICMPs are twice limited:
* by source and by destination.
*
* RFC 1812: 4.3.2.8 SHOULD be able to limit error message rate
* SHOULD allow setting of rate limits
*
* Shared between ICMPv4 and ICMPv6.
*/
#define XRLIM_BURST_FACTOR 6
bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout)
{
unsigned long now, token;
bool rc = false;
if (!peer)
return true;
token = peer->rate_tokens;
now = jiffies;
token += now - peer->rate_last;
peer->rate_last = now;
if (token > XRLIM_BURST_FACTOR * timeout)
token = XRLIM_BURST_FACTOR * timeout;
if (token >= timeout) {
token -= timeout;
rc = true;
}
peer->rate_tokens = token;
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| david s. miller | david s. miller | 95 | 100.00% | 1 | 100.00% |
| Total | 95 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL(inet_peer_xrlim_allow);
static void inetpeer_inval_rcu(struct rcu_head *head)
{
struct inet_peer *p = container_of(head, struct inet_peer, gc_rcu);
spin_lock_bh(&gc_lock);
list_add_tail(&p->gc_list, &gc_list);
spin_unlock_bh(&gc_lock);
schedule_delayed_work(&gc_work, gc_delay);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| eric dumazet | eric dumazet | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
void inetpeer_invalidate_tree(struct inet_peer_base *base)
{
struct inet_peer *root;
write_seqlock_bh(&base->lock);
root = rcu_deref_locked(base->root, base);
if (root != peer_avl_empty) {
base->root = peer_avl_empty_rcu;
base->total = 0;
call_rcu(&root->gc_rcu, inetpeer_inval_rcu);
}
write_sequnlock_bh(&base->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| steffen klassert | steffen klassert | 51 | 70.83% | 1 | 16.67% |
| eric dumazet | eric dumazet | 16 | 22.22% | 2 | 33.33% |
| david s. miller | david s. miller | 3 | 4.17% | 2 | 33.33% |
| gao feng | gao feng | 2 | 2.78% | 1 | 16.67% |
| Total | 72 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL(inetpeer_invalidate_tree);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| pre-git | pre-git | 966 | 40.85% | 1 | 1.92% |
| eric dumazet | eric dumazet | 749 | 31.67% | 18 | 34.62% |
| steffen klassert | steffen klassert | 298 | 12.60% | 1 | 1.92% |
| david s. miller | david s. miller | 273 | 11.54% | 13 | 25.00% |
| linus torvalds | linus torvalds | 14 | 0.59% | 2 | 3.85% |
| pavel emelianov | pavel emelianov | 12 | 0.51% | 1 | 1.92% |
| herbert xu | herbert xu | 9 | 0.38% | 1 | 1.92% |
| kris katterjohn | kris katterjohn | 6 | 0.25% | 1 | 1.92% |
| arnaldo carvalho de melo | arnaldo carvalho de melo | 6 | 0.25% | 2 | 3.85% |
| art haas | art haas | 6 | 0.25% | 1 | 1.92% |
| nicolas dichtel | nicolas dichtel | 6 | 0.25% | 1 | 1.92% |
| gao feng | gao feng | 5 | 0.21% | 1 | 1.92% |
| xiao jin | xiao jin | 3 | 0.13% | 1 | 1.92% |
| christoph hellwig | christoph hellwig | 3 | 0.13% | 1 | 1.92% |
| christoph lameter | christoph lameter | 2 | 0.08% | 1 | 1.92% |
| david ahern | david ahern | 2 | 0.08% | 1 | 1.92% |
| alexey dobriyan | alexey dobriyan | 1 | 0.04% | 1 | 1.92% |
| tejun heo | tejun heo | 1 | 0.04% | 1 | 1.92% |
| peter zijlstra | peter zijlstra | 1 | 0.04% | 1 | 1.92% |
| chen weilong | chen weilong | 1 | 0.04% | 1 | 1.92% |
| adrian bunk | adrian bunk | 1 | 0.04% | 1 | 1.92% |
| Total | 2365 | 100.00% | 52 | 100.00% |
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