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red hat 内核2.6.32的kernelfork.c在哪里？

小夏•2023-5-2•服务器知识•阅读104

red hat 内核2.6.32的kernelfork.c在哪里？,第1张

部分核心的代码在arch/*/kernel目录

*

 2  *  linux/kernel/fork.c

 3  *

 4  *  Copyright (C) 1991, 1992  Linus Torvalds

 5  */

 6

 7 /*

 8  *  'fork.c' contains the help-routines for the 'fork' system call

 9  * (see also entry.S and others).

10  * Fork is rather simple, once you get the hang of it, but the memory

11  * management can be a bitch. See 'mm/memory.c': 'copy_page_range()'

12  */

13

14 #include <linux/slab.h>

15 #include <linux/init.h>

16 #include <linux/unistd.h>

17 #include <linux/module.h>

18 #include <linux/vmalloc.h>

19 #include <linux/completion.h>

20 #include <linux/personality.h>

21 #include <linux/mempolicy.h>

22 #include <linux/sem.h>

23 #include <linux/file.h>

24 #include <linux/fdtable.h>

25 #include <linux/iocontext.h>

26 #include <linux/key.h>

27 #include <linux/binfmts.h>

28 #include <linux/mman.h>

29 #include <linux/mmu_notifier.h>

30 #include <linux/fs.h>

31 #include <linux/nsproxy.h>

32 #include <linux/capability.h>

33 #include <linux/cpu.h>

34 #include <linux/cgroup.h>

35 #include <linux/security.h>

36 #include <linux/hugetlb.h>

37 #include <linux/seccomp.h>

38 #include <linux/swap.h>

39 #include <linux/syscalls.h>

40 #include <linux/jiffies.h>

41 #include <linux/futex.h>

42 #include <linux/compat.h>

43 #include <linux/kthread.h>

44 #include <linux/task_io_accounting_ops.h>

45 #include <linux/rcupdate.h>

46 #include <linux/ptrace.h>

47 #include <linux/mount.h>

48 #include <linux/audit.h>

49 #include <linux/memcontrol.h>

50 #include <linux/ftrace.h>

51 #include <linux/proc_fs.h>

52 #include <linux/profile.h>

53 #include <linux/rmap.h>

54 #include <linux/ksm.h>

55 #include <linux/acct.h>

56 #include <linux/tsacct_kern.h>

57 #include <linux/cn_proc.h>

58 #include <linux/freezer.h>

59 #include <linux/delayacct.h>

60 #include <linux/taskstats_kern.h>

61 #include <linux/random.h>

62 #include <linux/tty.h>

63 #include <linux/blkdev.h>

64 #include <linux/fs_struct.h>

65 #include <linux/magic.h>

66 #include <linux/perf_event.h>

67 #include <linux/posix-timers.h>

68 #include <linux/user-return-notifier.h>

69 #include <linux/oom.h>

70 #include <linux/khugepaged.h>

71 #include <linux/signalfd.h>

72 #include <linux/uprobes.h>

73 #include <linux/aio.h>

74

75 #include <asm/pgtable.h>

76 #include <asm/pgalloc.h>

77 #include <asm/uaccess.h>

78 #include <asm/mmu_context.h>

79 #include <asm/cacheflush.h>

80 #include <asm/tlbflush.h>

81

82 #include <trace/events/sched.h>

83

84 #define CREATE_TRACE_POINTS

85 #include <trace/events/task.h>

86

87 /*

88  * Protected counters by write_lock_irq(&tasklist_lock)

89  */

90 unsigned long total_forks     /* Handle normal Linux uptimes. */

91 int nr_threads                /* The idle threads do not count.. */

92

93 int max_threads               /* tunable limit on nr_threads */

94

95 DEFINE_PER_CPU(unsigned long, process_counts) = 0

96

97 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock) /* outer */

98

99 #ifdef CONFIG_PROVE_RCU

100 int lockdep_tasklist_lock_is_held(void)

101 {

102         return lockdep_is_held(&tasklist_lock)

103 }

104 EXPORT_SYMBOL_GPL(lockdep_tasklist_lock_is_held)

105 #endif /* #ifdef CONFIG_PROVE_RCU */

106

107 int nr_processes(void)

108 {

109         int cpu

110         int total = 0

111

112         for_each_possible_cpu(cpu)

113                 total += per_cpu(process_counts, cpu)

114

115         return total

116 }

117

118 void __weak arch_release_task_struct(struct task_struct *tsk)

119 {

120 }

121

122 #ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR

123 static struct kmem_cache *task_struct_cachep

124

125 static inline struct task_struct *alloc_task_struct_node(int node)

126 {

127         return kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node)

128 }

129

130 static inline void free_task_struct(struct task_struct *tsk)

131 {

132         kmem_cache_free(task_struct_cachep, tsk)

133 }

134 #endif

135

136 void __weak arch_release_thread_info(struct thread_info *ti)

137 {

138 }

139

140 #ifndef CONFIG_ARCH_THREAD_INFO_ALLOCATOR

141

142 /*

143  * Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a

144  * kmemcache based allocator.

145  */

146 # if THREAD_SIZE >= PAGE_SIZE

147 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,

148                                                   int node)

149 {

150         struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,

151                                              THREAD_SIZE_ORDER)

152

153         return page ? page_address(page) : NULL

154 }

155

156 static inline void free_thread_info(struct thread_info *ti)

157 {

158         free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER)

159 }

160 # else

161 static struct kmem_cache *thread_info_cache

162

163 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,

164                                                   int node)

165 {

166         return kmem_cache_alloc_node(thread_info_cache, THREADINFO_GFP, node)

167 }

168

169 static void free_thread_info(struct thread_info *ti)

170 {

171         kmem_cache_free(thread_info_cache, ti)

172 }

173

174 void thread_info_cache_init(void)

175 {

176         thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,

177                                               THREAD_SIZE, 0, NULL)

178         BUG_ON(thread_info_cache == NULL)

179 }

180 # endif

181 #endif

182

183 /* SLAB cache for signal_struct structures (tsk->signal) */

184 static struct kmem_cache *signal_cachep

185

186 /* SLAB cache for sighand_struct structures (tsk->sighand) */

187 struct kmem_cache *sighand_cachep

188

189 /* SLAB cache for files_struct structures (tsk->files) */

190 struct kmem_cache *files_cachep

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一、新媒体是数字化的媒体形式。

包括所有数字化的传统媒体、网络媒体、移动端媒体、数字电视、数字报刊杂志等。

二、新媒体运营方式

通过现代化移动互联网手段，通过利用微信、微博、贴吧等新兴媒体平台工具进行产品宣传、推广、产品营销的一系列运营手段。通过策划品牌相关的优质、高度传播性的内容和线上活动，向客户广泛或者精准推送消息，提高参与度，提高知名度，从而充分利用粉丝经济，达到相应营销目的。

扩展资料

新媒体能在短时间内迅速吸收大量读者，跟它草根的特性远远分不开，使“人人都是新闻传播者”成为现实。

正是因为这种特性，让新媒体渐渐地改变了人们的思想观念甚至是生活方式。这种新的方式开启了社会新的领域，激发了一直“保持沉默”的草根群体，唤醒了他们都能亲自参与社会进程的诉求欲望和权利欲望。这也是新媒体能够迅速崛起，推动社会进步的最根本的也是最重要的力量。

参考资料来源：百度百科新媒体

欢迎分享，转载请注明来源：夏雨云

原文地址:https://www.xiayuyun.com/zonghe/327996.html

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