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Linux×÷Ϊһ¿î¿ªÔ´²Ù×÷ϵͳ£¬ÆäÄÚºËÔ´´úÂë×÷ΪÆäÉè¼ÆÓ빦ЧµÄ½¹µã²¿·Ö£¬±»ÆÕ±éÑо¿ºÍʹÓá£LinuxÄÚºËÔ´´úÂë°üÀ¨ÁËÐí¶àÎļþ£¬Ã¿¸öÎļþÈÏÕæ²î±ðµÄ¹¦Ð§Ä£¿é¡£ÔÚÕâƪÎÄÕÂÖУ¬ÎÒÃǽ«ÉîÈë̽ѰLinuxÄÚºËÔ´´úÂëÖм¸¸öÒªº¦ÎļþµÄ×÷ÓúÍÏêϸ´úÂëʾÀý£¬×ÊÖú¶ÁÕ߸üºÃµØÃ÷È·LinuxÄں˵ÄÉè¼ÆºÍÔËÐС£

kernel/sched/core.c – Õâ¸öÎļþʵÏÖÁËLinuxÄÚºËÖеĵ÷ÀíÆ÷¡£µ÷ÀíÆ÷ÈÏÕæ¾öÒéÄĸöÀú³ÌÔÚʲôʱ¼äÖ´ÐУ¬ÒÔʵÏÖʱ¼äƬÂÖת¡¢ÓÅÏȼ¶µ÷ÀíµÈ¹¦Ð§¡£ÏÂÃæÊÇÒ»¸ö¼òÆӵĴúÂëʾÀý£º

#include <linux/sched.h>
#include <linux/sched/signal.h>

void schedule(void)
{
    struct task_struct *prev, *next;

    prev = current;
    
    next = pick_next_task(); // Ñ¡ÔñÏÂÒ»¸öÒªÔËÐеÄÀú³Ì

    switch_to(next); // Çл»µ½ÏÂÒ»¸öÀú³ÌÖ´ÐÐ
}

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kernel/slab.c – Õâ¸öÎļþʵÏÖÁËLinuxÄÚºËÖеÄSlab·ÖÅÉÆ÷¡£Slab·ÖÅÉÆ÷ÓÃÓÚ¸ßЧµØ·ÖÅɺͽÓÄÉÄڴ棬Ìá¸ßϵͳµÄÐÔÄÜ¡£ÏÂÃæÊÇÒ»¸ö¼òÆӵĴúÂëʾÀý£º

#include <linux/slab.h>

void *kmalloc(size_t size, gfp_t flags)
{
    struct kmem_cache *cache;
    void *ptr;

    cache = get_cache_for_size(size); // ƾ֤·ÖÅɾÞϸ»ñÈ¡ºÏÊʵĻº´æ
    ptr = alloc_slab(cache); // ´Ó»º´æÖзÖÅÉÄÚ´æ

    return ptr;
}

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kernel/fs/namei.c – Õâ¸öÎļþʵÏÖÁËLinuxÄÚºËÖеÄ·¾¶ÆÊÎöºÍÎļþϵͳ²Ù×÷¡£Â·¾¶ÆÊÎöÓÃÓÚ½«Óû§Ì¬´«ÈëµÄÎļþ·¾¶×ª»»³ÉÄÚºËÖеÄinode£¬¾ÙÐÐÎļþ²Ù×÷¡£ÏÂÃæÊÇÒ»¸ö¼òÆӵĴúÂëʾÀý£º

#include <linux/fs.h>
#include <linux/path.h>

int vfs_open(const char *pathname, int flags, int mode)
{
    struct path path;
    struct file *file;
    
    int err = kern_path(pathname, LOOKUP_FOLLOW, &path);

    if (!err)
    {
        file = filp_open(&path, flags, mode);
        if (IS_ERR(file))
        {
            err = PTR_ERR(file);
        }
    }
    
    return err;
}

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