[Xen-devel] Question about four kinds of pages in struct xc_dominfo

[Meng Xu <xumengpanda@xxxxxxxxx>]

Hi,

I'm trying to print out the "current used" pages of each domU. 

I'm reading the xen code and found the data structure xc_dominfo at file tools/libxc/xenctrl.h. 

I have a simple, maybe very naive question: 

1) What is the difference among *nr_outstanding_pages*, * nr_shared_pages*, and *nr_paged_pages*?

2) Could anyone point me to a place that I can find the document of the definition of the structures in xen code, so that I can find those definition by myself? 

 

I'm new to the xen source and hope you can give me some guide to hack the xen code. 

========The structure is as below======================
"tools/libxc/xenctrl.h"

/*

 * DOMAIN MANAGEMENT FUNCTIONS   

 */

typedef struct xc_dominfo {

    uint32_t      domid;

    uint32_t      ssidref;

    unsigned int  dying:1, crashed:1, shutdown:1,

                  paused:1, blocked:1, running:1,

                  hvm:1, debugged:1;

    unsigned int  shutdown_reason; /* only meaningful if shutdown==1 */

    unsigned long nr_pages; /* current number, not maximum */

    unsigned long nr_outstanding_pages;

    unsigned long nr_shared_pages;

    unsigned long nr_paged_pages;

    unsigned long shared_info_frame;

    uint64_t      cpu_time;

    unsigned long max_memkb;

    unsigned int  nr_online_vcpus;

    unsigned int  max_vcpu_id;

    xen_domain_handle_t handle;

    unsigned int  cpupool;

} xc_dominfo_t; 

Thank you very much for your time and help in these questions!

Happy New Year!

Best,

Meng

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