cregit-Linux how code gets into the kernel

Release 4.7 kernel/pid.c

Directory: kernel
/*
 * Generic pidhash and scalable, time-bounded PID allocator
 *
 * (C) 2002-2003 Nadia Yvette Chambers, IBM
 * (C) 2004 Nadia Yvette Chambers, Oracle
 * (C) 2002-2004 Ingo Molnar, Red Hat
 *
 * pid-structures are backing objects for tasks sharing a given ID to chain
 * against. There is very little to them aside from hashing them and
 * parking tasks using given ID's on a list.
 *
 * The hash is always changed with the tasklist_lock write-acquired,
 * and the hash is only accessed with the tasklist_lock at least
 * read-acquired, so there's no additional SMP locking needed here.
 *
 * We have a list of bitmap pages, which bitmaps represent the PID space.
 * Allocating and freeing PIDs is completely lockless. The worst-case
 * allocation scenario when all but one out of 1 million PIDs possible are
 * allocated already: the scanning of 32 list entries and at most PAGE_SIZE
 * bytes. The typical fastpath is a single successful setbit. Freeing is O(1).
 *
 * Pid namespaces:
 *    (C) 2007 Pavel Emelyanov <xemul@openvz.org>, OpenVZ, SWsoft Inc.
 *    (C) 2007 Sukadev Bhattiprolu <sukadev@us.ibm.com>, IBM
 *     Many thanks to Oleg Nesterov for comments and help
 *
 */

#include <linux/mm.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/rculist.h>
#include <linux/bootmem.h>
#include <linux/hash.h>
#include <linux/pid_namespace.h>
#include <linux/init_task.h>
#include <linux/syscalls.h>
#include <linux/proc_ns.h>
#include <linux/proc_fs.h>


#define pid_hashfn(nr, ns)	\
	hash_long((unsigned long)nr + (unsigned long)ns, pidhash_shift)

static struct hlist_head *pid_hash;

static unsigned int pidhash_shift = 4;

struct pid init_struct_pid = INIT_STRUCT_PID;


int pid_max = PID_MAX_DEFAULT;


#define RESERVED_PIDS		300


int pid_max_min = RESERVED_PIDS + 1;

int pid_max_max = PID_MAX_LIMIT;


static inline int mk_pid(struct pid_namespace *pid_ns, struct pidmap *map, int off) { return (map - pid_ns->pidmap)*BITS_PER_PAGE + off; }

Contributors

PersonTokensPropCommitsCommitProp
sukadev bhattiprolusukadev bhattiprolu2781.82%266.67%
william lee irwin iiiwilliam lee irwin iii618.18%133.33%
Total33100.00%3100.00%

#define find_next_offset(map, off) \ find_next_zero_bit((map)->page, BITS_PER_PAGE, off) /* * PID-map pages start out as NULL, they get allocated upon * first use and are never deallocated. This way a low pid_max * value does not cause lots of bitmaps to be allocated, but * the scheme scales to up to 4 million PIDs, runtime. */ struct pid_namespace init_pid_ns = { .kref = { .refcount = ATOMIC_INIT(2), }, .pidmap = { [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL } }, .last_pid = 0, .nr_hashed = PIDNS_HASH_ADDING, .level = 0, .child_reaper = &init_task, .user_ns = &init_user_ns, .ns.inum = PROC_PID_INIT_INO, #ifdef CONFIG_PID_NS .ns.ops = &pidns_operations, #endif }; EXPORT_SYMBOL_GPL(init_pid_ns); /* * Note: disable interrupts while the pidmap_lock is held as an * interrupt might come in and do read_lock(&tasklist_lock). * * If we don't disable interrupts there is a nasty deadlock between * detach_pid()->free_pid() and another cpu that does * spin_lock(&pidmap_lock) followed by an interrupt routine that does * read_lock(&tasklist_lock); * * After we clean up the tasklist_lock and know there are no * irq handlers that take it we can leave the interrupts enabled. * For now it is easier to be safe than to prove it can't happen. */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(pidmap_lock);
static void free_pidmap(struct upid *upid) { int nr = upid->nr; struct pidmap *map = upid->ns->pidmap + nr / BITS_PER_PAGE; int offset = nr & BITS_PER_PAGE_MASK; clear_bit(offset, map->page); atomic_inc(&map->nr_free); }

Contributors

PersonTokensPropCommitsCommitProp
ingo molnaringo molnar3663.16%120.00%
oleg nesterovoleg nesterov1424.56%120.00%
sukadev bhattiprolusukadev bhattiprolu610.53%240.00%
eric w. biedermaneric w. biederman11.75%120.00%
Total57100.00%5100.00%

/* * If we started walking pids at 'base', is 'a' seen before 'b'? */
static int pid_before(int base, int a, int b) { /* * This is the same as saying * * (a - base + MAXUINT) % MAXUINT < (b - base + MAXUINT) % MAXUINT * and that mapping orders 'a' and 'b' with respect to 'base'. */ return (unsigned)(a - base) < (unsigned)(b - base); }

Contributors

PersonTokensPropCommitsCommitProp
salman qazisalman qazi35100.00%1100.00%
Total35100.00%1100.00%

/* * We might be racing with someone else trying to set pid_ns->last_pid * at the pid allocation time (there's also a sysctl for this, but racing * with this one is OK, see comment in kernel/pid_namespace.c about it). * We want the winner to have the "later" value, because if the * "earlier" value prevails, then a pid may get reused immediately. * * Since pids rollover, it is not sufficient to just pick the bigger * value. We have to consider where we started counting from. * * 'base' is the value of pid_ns->last_pid that we observed when * we started looking for a pid. * * 'pid' is the pid that we eventually found. */
static void set_last_pid(struct pid_namespace *pid_ns, int base, int pid) { int prev; int last_write = base; do { prev = last_write; last_write = cmpxchg(&pid_ns->last_pid, prev, pid); } while ((prev != last_write) && (pid_before(base, last_write, pid))); }

Contributors

PersonTokensPropCommitsCommitProp
salman qazisalman qazi66100.00%1100.00%
Total66100.00%1100.00%


static int alloc_pidmap(struct pid_namespace *pid_ns) { int i, offset, max_scan, pid, last = pid_ns->last_pid; struct pidmap *map; pid = last + 1; if (pid >= pid_max) pid = RESERVED_PIDS; offset = pid & BITS_PER_PAGE_MASK; map = &pid_ns->pidmap[pid/BITS_PER_PAGE]; /* * If last_pid points into the middle of the map->page we * want to scan this bitmap block twice, the second time * we start with offset == 0 (or RESERVED_PIDS). */ max_scan = DIV_ROUND_UP(pid_max, BITS_PER_PAGE) - !offset; for (i = 0; i <= max_scan; ++i) { if (unlikely(!map->page)) { void *page = kzalloc(PAGE_SIZE, GFP_KERNEL); /* * Free the page if someone raced with us * installing it: */ spin_lock_irq(&pidmap_lock); if (!map->page) { map->page = page; page = NULL; } spin_unlock_irq(&pidmap_lock); kfree(page); if (unlikely(!map->page)) return -ENOMEM; } if (likely(atomic_read(&map->nr_free))) { for ( ; ; ) { if (!test_and_set_bit(offset, map->page)) { atomic_dec(&map->nr_free); set_last_pid(pid_ns, last, pid); return pid; } offset = find_next_offset(map, offset); if (offset >= BITS_PER_PAGE) break; pid = mk_pid(pid_ns, map, offset); if (pid >= pid_max) break; } } if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) { ++map; offset = 0; } else { map = &pid_ns->pidmap[0]; offset = RESERVED_PIDS; if (unlikely(last == offset)) break; } pid = mk_pid(pid_ns, map, offset); } return -EAGAIN; }

Contributors

PersonTokensPropCommitsCommitProp
ingo molnaringo molnar13140.18%216.67%
william lee irwin iiiwilliam lee irwin iii12137.12%18.33%
sukadev bhattiprolusukadev bhattiprolu278.28%325.00%
raphael s. carvalhoraphael s. carvalho164.91%18.33%
andre goddard rosaandre goddard rosa123.68%18.33%
salman qazisalman qazi61.84%18.33%
michal hockomichal hocko51.53%18.33%
oleg nesterovoleg nesterov51.53%18.33%
eric w. biedermaneric w. biederman30.92%18.33%
Total326100.00%12100.00%


int next_pidmap(struct pid_namespace *pid_ns, unsigned int last) { int offset; struct pidmap *map, *end; if (last >= PID_MAX_LIMIT) return -1; offset = (last + 1) & BITS_PER_PAGE_MASK; map = &pid_ns->pidmap[(last + 1)/BITS_PER_PAGE]; end = &pid_ns->pidmap[PIDMAP_ENTRIES]; for (; map < end; map++, offset = 0) { if (unlikely(!map->page)) continue; offset = find_next_bit((map)->page, BITS_PER_PAGE, offset); if (offset < BITS_PER_PAGE) return mk_pid(pid_ns, map, offset); } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman11787.97%360.00%
linus torvaldslinus torvalds118.27%120.00%
sukadev bhattiprolusukadev bhattiprolu53.76%120.00%
Total133100.00%5100.00%


void put_pid(struct pid *pid) { struct pid_namespace *ns; if (!pid) return; ns = pid->numbers[pid->level].ns; if ((atomic_read(&pid->count) == 1) || atomic_dec_and_test(&pid->count)) { kmem_cache_free(ns->pid_cachep, pid); put_pid_ns(ns); } }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman3143.06%120.00%
pavel emelianovpavel emelianov2737.50%240.00%
ingo molnaringo molnar1318.06%120.00%
nick pigginnick piggin11.39%120.00%
Total72100.00%5100.00%

EXPORT_SYMBOL_GPL(put_pid);
static void delayed_put_pid(struct rcu_head *rhp) { struct pid *pid = container_of(rhp, struct pid, rcu); put_pid(pid); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman1961.29%150.00%
ingo molnaringo molnar1238.71%150.00%
Total31100.00%2100.00%


void free_pid(struct pid *pid) { /* We can be called with write_lock_irq(&tasklist_lock) held */ int i; unsigned long flags; spin_lock_irqsave(&pidmap_lock, flags); for (i = 0; i <= pid->level; i++) { struct upid *upid = pid->numbers + i; struct pid_namespace *ns = upid->ns; hlist_del_rcu(&upid->pid_chain); switch(--ns->nr_hashed) { case 2: case 1: /* When all that is left in the pid namespace * is the reaper wake up the reaper. The reaper * may be sleeping in zap_pid_ns_processes(). */ wake_up_process(ns->child_reaper); break; case PIDNS_HASH_ADDING: /* Handle a fork failure of the first process */ WARN_ON(ns->child_reaper); ns->nr_hashed = 0; /* fall through */ case 0: schedule_work(&ns->proc_work); break; } } spin_unlock_irqrestore(&pidmap_lock, flags); for (i = 0; i <= pid->level; i++) free_pidmap(pid->numbers + i); call_rcu(&pid->rcu, delayed_put_pid); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman8852.69%541.67%
pavel emelianovpavel emelianov3923.35%216.67%
oleg nesterovoleg nesterov1911.38%216.67%
ingo molnaringo molnar158.98%216.67%
kirill korotaevkirill korotaev63.59%18.33%
Total167100.00%12100.00%


struct pid *alloc_pid(struct pid_namespace *ns) { struct pid *pid; enum pid_type type; int i, nr; struct pid_namespace *tmp; struct upid *upid; int retval = -ENOMEM; pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL); if (!pid) return ERR_PTR(retval); tmp = ns; pid->level = ns->level; for (i = ns->level; i >= 0; i--) { nr = alloc_pidmap(tmp); if (nr < 0) { retval = nr; goto out_free; } pid->numbers[i].nr = nr; pid->numbers[i].ns = tmp; tmp = tmp->parent; } if (unlikely(is_child_reaper(pid))) { if (pid_ns_prepare_proc(ns)) goto out_free; } get_pid_ns(ns); atomic_set(&pid->count, 1); for (type = 0; type < PIDTYPE_MAX; ++type) INIT_HLIST_HEAD(&pid->tasks[type]); upid = pid->numbers + ns->level; spin_lock_irq(&pidmap_lock); if (!(ns->nr_hashed & PIDNS_HASH_ADDING)) goto out_unlock; for ( ; upid >= pid->numbers; --upid) { hlist_add_head_rcu(&upid->pid_chain, &pid_hash[pid_hashfn(upid->nr, upid->ns)]); upid->ns->nr_hashed++; } spin_unlock_irq(&pidmap_lock); return pid; out_unlock: spin_unlock_irq(&pidmap_lock); put_pid_ns(ns); out_free: while (++i <= ns->level) free_pidmap(pid->numbers + i); kmem_cache_free(ns->pid_cachep, pid); return ERR_PTR(retval); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman12737.91%529.41%
pavel emelianovpavel emelianov10932.54%317.65%
ingo molnaringo molnar329.55%211.76%
michal hockomichal hocko247.16%15.88%
kirill korotaevkirill korotaev154.48%15.88%
andre goddard rosaandre goddard rosa154.48%15.88%
oleg nesterovoleg nesterov92.69%211.76%
arnd bergmannarnd bergmann20.60%15.88%
sukadev bhattiprolusukadev bhattiprolu20.60%15.88%
Total335100.00%17100.00%


void disable_pid_allocation(struct pid_namespace *ns) { spin_lock_irq(&pidmap_lock); ns->nr_hashed &= ~PIDNS_HASH_ADDING; spin_unlock_irq(&pidmap_lock); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman29100.00%1100.00%
Total29100.00%1100.00%


struct pid *find_pid_ns(int nr, struct pid_namespace *ns) { struct upid *pnr; hlist_for_each_entry_rcu(pnr, &pid_hash[pid_hashfn(nr, ns)], pid_chain) if (pnr->nr == nr && pnr->ns == ns) return container_of(pnr, struct pid, numbers[ns->level]); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov3049.18%133.33%
eric w. biedermaneric w. biederman2947.54%133.33%
kirill korotaevkirill korotaev23.28%133.33%
Total61100.00%3100.00%

EXPORT_SYMBOL_GPL(find_pid_ns);
struct pid *find_vpid(int nr) { return find_pid_ns(nr, task_active_pid_ns(current)); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov1885.71%150.00%
eric w. biedermaneric w. biederman314.29%150.00%
Total21100.00%2100.00%

EXPORT_SYMBOL_GPL(find_vpid); /* * attach_pid() must be called with the tasklist_lock write-held. */
void attach_pid(struct task_struct *task, enum pid_type type) { struct pid_link *link = &task->pids[type]; hlist_add_head_rcu(&link->node, &link->pid->tasks[type]); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman3782.22%120.00%
oleg nesterovoleg nesterov511.11%240.00%
ingo molnaringo molnar36.67%240.00%
Total45100.00%5100.00%


static void __change_pid(struct task_struct *task, enum pid_type type, struct pid *new) { struct pid_link *link; struct pid *pid; int tmp; link = &task->pids[type]; pid = link->pid; hlist_del_rcu(&link->node); link->pid = new; for (tmp = PIDTYPE_MAX; --tmp >= 0; ) if (!hlist_empty(&pid->tasks[tmp])) return; free_pid(pid); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman4446.32%114.29%
ingo molnaringo molnar3233.68%342.86%
oleg nesterovoleg nesterov1616.84%228.57%
kirill korotaevkirill korotaev33.16%114.29%
Total95100.00%7100.00%


void detach_pid(struct task_struct *task, enum pid_type type) { __change_pid(task, type, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
oleg nesterovoleg nesterov23100.00%1100.00%
Total23100.00%1100.00%


void change_pid(struct task_struct *task, enum pid_type type, struct pid *pid) { __change_pid(task, type, pid); attach_pid(task, type); }

Contributors

PersonTokensPropCommitsCommitProp
oleg nesterovoleg nesterov35100.00%1100.00%
Total35100.00%1100.00%

/* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */
void transfer_pid(struct task_struct *old, struct task_struct *new, enum pid_type type) { new->pids[type].pid = old->pids[type].pid; hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman60100.00%1100.00%
Total60100.00%1100.00%


struct task_struct *pid_task(struct pid *pid, enum pid_type type) { struct task_struct *result = NULL; if (pid) { struct hlist_node *first; first = rcu_dereference_check(hlist_first_rcu(&pid->tasks[type]), lockdep_tasklist_lock_is_held()); if (first) result = hlist_entry(first, struct task_struct, pids[(type)].node); } return result; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman5265.82%116.67%
ingo molnaringo molnar1316.46%116.67%
kirill korotaevkirill korotaev67.59%116.67%
arnd bergmannarnd bergmann45.06%116.67%
paul e. mckenneypaul e. mckenney45.06%233.33%
Total79100.00%6100.00%

EXPORT_SYMBOL(pid_task); /* * Must be called under rcu_read_lock(). */
struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns) { RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "find_task_by_pid_ns() needs rcu_read_lock() protection"); return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID); }

Contributors

PersonTokensPropCommitsCommitProp
ingo molnaringo molnar924.32%225.00%
eric w. biedermaneric w. biederman821.62%112.50%
pavel emelianovpavel emelianov821.62%112.50%
tetsuo handatetsuo handa513.51%112.50%
paul e. mckenneypaul e. mckenney410.81%225.00%
christoph hellwigchristoph hellwig38.11%112.50%
Total37100.00%8100.00%


struct task_struct *find_task_by_vpid(pid_t vnr) { return find_task_by_pid_ns(vnr, task_active_pid_ns(current)); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov1780.95%133.33%
eric w. biedermaneric w. biederman314.29%133.33%
christoph hellwigchristoph hellwig14.76%133.33%
Total21100.00%3100.00%


struct pid *get_task_pid(struct task_struct *task, enum pid_type type) { struct pid *pid; rcu_read_lock(); if (type != PIDTYPE_PID) task = task->group_leader; pid = get_pid(rcu_dereference(task->pids[type].pid)); rcu_read_unlock(); return pid; }

Contributors

PersonTokensPropCommitsCommitProp
oleg nesterovoleg nesterov5694.92%266.67%
eric dumazeteric dumazet35.08%133.33%
Total59100.00%3100.00%

EXPORT_SYMBOL_GPL(get_task_pid);
struct task_struct *get_pid_task(struct pid *pid, enum pid_type type) { struct task_struct *result; rcu_read_lock(); result = pid_task(pid, type); if (result) get_task_struct(result); rcu_read_unlock(); return result; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman48100.00%1100.00%
Total48100.00%1100.00%

EXPORT_SYMBOL_GPL(get_pid_task);
struct pid *find_get_pid(pid_t nr) { struct pid *pid; rcu_read_lock(); pid = get_pid(find_vpid(nr)); rcu_read_unlock(); return pid; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman3397.06%150.00%
pavel emelianovpavel emelianov12.94%150.00%
Total34100.00%2100.00%

EXPORT_SYMBOL_GPL(find_get_pid);
pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns) { struct upid *upid; pid_t nr = 0; if (pid && ns->level <= pid->level) { upid = &pid->numbers[ns->level]; if (upid->ns == ns) nr = upid->nr; } return nr; }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov68100.00%1100.00%
Total68100.00%1100.00%

EXPORT_SYMBOL_GPL(pid_nr_ns);
pid_t pid_vnr(struct pid *pid) { return pid_nr_ns(pid, task_active_pid_ns(current)); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman21100.00%2100.00%
Total21100.00%2100.00%

EXPORT_SYMBOL_GPL(pid_vnr);
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns) { pid_t nr = 0; rcu_read_lock(); if (!ns) ns = task_active_pid_ns(current); if (likely(pid_alive(task))) { if (type != PIDTYPE_PID) task = task->group_leader; nr = pid_nr_ns(rcu_dereference(task->pids[type].pid), ns); } rcu_read_unlock(); return nr; }

Contributors

PersonTokensPropCommitsCommitProp
oleg nesterovoleg nesterov5562.50%125.00%
pavel emelianovpavel emelianov2730.68%125.00%
eric dumazeteric dumazet33.41%125.00%
eric w. biedermaneric w. biederman33.41%125.00%
Total88100.00%4100.00%

EXPORT_SYMBOL(__task_pid_nr_ns);
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) { return pid_nr_ns(task_tgid(tsk), ns); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov2492.31%150.00%
oleg nesterovoleg nesterov27.69%150.00%
Total26100.00%2100.00%

EXPORT_SYMBOL(task_tgid_nr_ns);
struct pid_namespace *task_active_pid_ns(struct task_struct *tsk) { return ns_of_pid(task_pid(tsk)); }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman21100.00%1100.00%
Total21100.00%1100.00%

EXPORT_SYMBOL_GPL(task_active_pid_ns); /* * Used by proc to find the first pid that is greater than or equal to nr. * * If there is a pid at nr this function is exactly the same as find_pid_ns. */
struct pid *find_ge_pid(int nr, struct pid_namespace *ns) { struct pid *pid; do { pid = find_pid_ns(nr, ns); if (pid) break; nr = next_pidmap(ns, nr); } while (nr > 0); return pid; }

Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman4783.93%266.67%
pavel emelianovpavel emelianov916.07%133.33%
Total56100.00%3100.00%

/* * The pid hash table is scaled according to the amount of memory in the * machine. From a minimum of 16 slots up to 4096 slots at one gigabyte or * more. */
void __init pidhash_init(void) { unsigned int i, pidhash_size; pid_hash = alloc_large_system_hash("PID", sizeof(*pid_hash), 0, 18, HASH_EARLY | HASH_SMALL, &pidhash_shift, NULL, 0, 4096); pidhash_size = 1U << pidhash_shift; for (i = 0; i < pidhash_size; i++) INIT_HLIST_HEAD(&pid_hash[i]); }

Contributors

PersonTokensPropCommitsCommitProp
pavel emelianovpavel emelianov5069.44%240.00%
jan beulichjan beulich1825.00%120.00%
dimitri sivanichdimitri sivanich22.78%120.00%
tim birdtim bird22.78%120.00%
Total72100.00%5100.00%


void __init pidmap_init(void) { /* Verify no one has done anything silly: */ BUILD_BUG_ON(PID_MAX_LIMIT >= PIDNS_HASH_ADDING); /* bump default and minimum pid_max based on number of cpus */ pid_max = min(pid_max_max, max_t(int, pid_max, PIDS_PER_CPU_DEFAULT * num_possible_cpus())); pid_max_min = max_t(int, pid_max_min, PIDS_PER_CPU_MIN * num_possible_cpus()); pr_info("pid_max: default: %u minimum: %u\n", pid_max, pid_max_min); init_pid_ns.pidmap[0].page = kzalloc(PAGE_SIZE, GFP_KERNEL); /* Reserve PID 0. We never call free_pidmap(0) */ set_bit(0, init_pid_ns.pidmap[0].page); atomic_dec(&init_pid_ns.pidmap[0].nr_free); init_pid_ns.pid_cachep = KMEM_CACHE(pid, SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT); }

Contributors

PersonTokensPropCommitsCommitProp
hedi berrichehedi berriche4336.44%17.69%
pavel emelianovpavel emelianov3529.66%323.08%
sukadev bhattiprolusukadev bhattiprolu1815.25%323.08%
andrew mortonandrew morton97.63%17.69%
eric w. biedermaneric w. biederman97.63%215.38%
vladimir davydovvladimir davydov21.69%17.69%
zhen leizhen lei10.85%17.69%
ingo molnaringo molnar10.85%17.69%
Total118100.00%13100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
eric w. biedermaneric w. biederman87233.04%1819.15%
pavel emelianovpavel emelianov49718.83%1212.77%
ingo molnaringo molnar35113.30%55.32%
oleg nesterovoleg nesterov2419.13%1010.64%
william lee irwin iiiwilliam lee irwin iii1495.65%22.13%
sukadev bhattiprolusukadev bhattiprolu1194.51%99.57%
salman qazisalman qazi1084.09%11.06%
hedi berrichehedi berriche431.63%11.06%
kirill korotaevkirill korotaev321.21%11.06%
michal hockomichal hocko291.10%11.06%
andre goddard rosaandre goddard rosa271.02%22.13%
raphael s. carvalhoraphael s. carvalho210.80%22.13%
jan beulichjan beulich210.80%11.06%
al viroal viro180.68%22.13%
andrew mortonandrew morton170.64%11.06%
cedric le goatercedric le goater130.49%11.06%
linus torvaldslinus torvalds110.42%11.06%
rik van rielrik van riel100.38%11.06%
paul e. mckenneypaul e. mckenney80.30%44.26%
tetsuo handatetsuo handa60.23%22.13%
eric dumazeteric dumazet60.23%11.06%
arnd bergmannarnd bergmann60.23%22.13%
david sterbadavid sterba50.19%11.06%
thomas gleixnerthomas gleixner50.19%11.06%
christoph hellwigchristoph hellwig40.15%11.06%
david howellsdavid howells30.11%11.06%
franck bui-huufranck bui-huu30.11%11.06%
nick pigginnick piggin20.08%11.06%
arnaldo carvalho de meloarnaldo carvalho de melo20.08%11.06%
dimitri sivanichdimitri sivanich20.08%11.06%
tim birdtim bird20.08%11.06%
vladimir davydovvladimir davydov20.08%11.06%
nadia yvette chambersnadia yvette chambers10.04%11.06%
frederik schwarzerfrederik schwarzer10.04%11.06%
paul gortmakerpaul gortmaker10.04%11.06%
zhen leizhen lei10.04%11.06%
Total2639100.00%94100.00%
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