Editing BC proc entries
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This page describes proc interface of [[UBC]] subsystem. | This page describes proc interface of [[UBC]] subsystem. | ||
== Old interface == | == Old interface == | ||
− | + | [[Proc/user_beancounters|Old interface]] consisted of 2 (optionally 3) files | |
− | ; <code> | + | ; <code>user_beancounters</code> |
− | : reveals an overall information about resource consumption of each beancounter in system | + | : reveals an overall information about resource consumption of each beancounter in system |
− | ; <code> | + | ; <code>user_beancounters_sub</code> |
− | : reveals information about all beancounters and sub-beancounters in system | + | : reveals information about all beancounters and sub-beancounters in system |
− | ; <code> | + | ; <code>user_beancounters_debug</code> |
− | : | + | : this files is shown if <code>CONFIG_UBC_DEBUG_KMEM</code> option is turned on and shows debugging information about each beancounter. This includes the numbers of |
− | + | # objects charged from each slab | |
− | + | # pages charged | |
− | + | # vmalloc-ed pages | |
− | + | # page beancounters | |
− | + | # etc | |
== New interface == | == New interface == | ||
− | In new interface only <code> | + | In new interface only <code>user_beancounters</code> entry is left for compatibility with old tools. New entries reside in <code>/proc/bc</code> directory. This directory also contains subdirectories for each beancounter in the system. E.g. |
<pre> | <pre> | ||
# ls /proc/bc/ | # ls /proc/bc/ | ||
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=== Existing general entries === | === Existing general entries === | ||
; <code>/proc/bc/resources</code> | ; <code>/proc/bc/resources</code> | ||
− | : This entry looks like old <code> | + | : This entry looks like old <code>user_beancounters</code> entry but |
− | + | # it doesn't contain “dummy” resources | |
− | + | # if new resource is added to BC it will appear in this entry only | |
; <code>/proc/bc/$BCID/resources</code> | ; <code>/proc/bc/$BCID/resources</code> | ||
− | : This entry shows the same as <code> | + | : This entry shows the same as <code>bc/resources</code> does but for <code>$BCID</code> beancounter only. |
; <code>/proc/bc/$BCID/vmaux</code> | ; <code>/proc/bc/$BCID/vmaux</code> | ||
: This entry shows auxiliary resources used in VM accounting. | : This entry shows auxiliary resources used in VM accounting. | ||
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=== Other entries === | === Other entries === | ||
− | The following subsystems add their own entries in <code>/proc/bc</code> and <code>/proc/bc/$BCID</code> | + | The following subsystems add their own entries in <code>/proc/bc</code> and <code>/proc/bc/$BCID</code> |
* [[IO accounting]] | * [[IO accounting]] | ||
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; <code>struct bc_proc_entry;</code> | ; <code>struct bc_proc_entry;</code> | ||
: This describes an entry that may show per-beancounter info. This looks like this: | : This describes an entry that may show per-beancounter info. This looks like this: | ||
− | < | + | <pre> |
struct bc_proc_entry { | struct bc_proc_entry { | ||
char *name; | char *name; | ||
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struct bc_proc_entry *next; | struct bc_proc_entry *next; | ||
}; | }; | ||
− | </ | + | </pre> |
* <code>name</code> is the entry name as it will appear in <code>/proc/bc/$BCID</code> | * <code>name</code> is the entry name as it will appear in <code>/proc/bc/$BCID</code> | ||
* <code>show</code> is a callback that is to fill info about particulat beancounter | * <code>show</code> is a callback that is to fill info about particulat beancounter | ||
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: This call registers an entry that shows per-beancounter info. | : This call registers an entry that shows per-beancounter info. | ||
− | The code that fills info about BC must look like this | + | The code that fills info about BC must look like this |
− | < | + | <pre> |
static int bc_my_show(struct seq_file *f, void *v) | static int bc_my_show(struct seq_file *f, void *v) | ||
{ | { | ||
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late_initcall(bc_my_init); | late_initcall(bc_my_init); | ||
− | </ | + | </pre> |
{{note|Due to limitations in <code>single_open</code> the <code>struct user_beancounter</code> pointer is not passed as <code>void *v</code> into showing function but must be obtained from <code>seq_file</code> with <code>seq_beancounter</code>}} | {{note|Due to limitations in <code>single_open</code> the <code>struct user_beancounter</code> pointer is not passed as <code>void *v</code> into showing function but must be obtained from <code>seq_file</code> with <code>seq_beancounter</code>}} | ||
+ | |||
+ | [[Category:UBC]] |