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spa: support: loop: move struct members

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Move the boolean members of `struct source_impl` to the end
of the struct. This changes the size of the struct from
104 bytes to 96 bytes on x86-64.

Before:

struct source_impl {
        struct spa_source          source;               /*     0    48 */
        struct impl *              impl;                 /*    48     8 */
        struct spa_list            link;                 /*    56    16 */
        /* --- cacheline 1 boundary (64 bytes) was 8 bytes ago --- */
        _Bool                      close;                /*    72     1 */

        /* XXX 7 bytes hole, try to pack */

        union {
                spa_source_io_func_t io;                 /*    80     8 */
                spa_source_idle_func_t idle;             /*    80     8 */
                spa_source_event_func_t event;           /*    80     8 */
                spa_source_timer_func_t timer;           /*    80     8 */
                spa_source_signal_func_t signal;         /*    80     8 */
        } func;                                          /*    80     8 */
        _Bool                      enabled;              /*    88     1 */

        /* XXX 7 bytes hole, try to pack */

        struct spa_source *        fallback;             /*    96     8 */

        /* size: 104, cachelines: 2, members: 7 */
        /* sum members: 90, holes: 2, sum holes: 14 */
        /* last cacheline: 40 bytes */
};

After:

struct source_impl {
        struct spa_source          source;               /*     0    48 */
        struct impl *              impl;                 /*    48     8 */
        struct spa_list            link;                 /*    56    16 */
        /* --- cacheline 1 boundary (64 bytes) was 8 bytes ago --- */
        union {
                spa_source_io_func_t io;                 /*    72     8 */
                spa_source_idle_func_t idle;             /*    72     8 */
                spa_source_event_func_t event;           /*    72     8 */
                spa_source_timer_func_t timer;           /*    72     8 */
                spa_source_signal_func_t signal;         /*    72     8 */
        } func;                                          /*    72     8 */
        struct spa_source *        fallback;             /*    80     8 */
        _Bool                      close;                /*    88     1 */
        _Bool                      enabled;              /*    89     1 */

        /* size: 96, cachelines: 2, members: 7 */
        /* padding: 6 */
        /* last cacheline: 32 bytes */
};
This commit is contained in:
Barnabás Pőcze 2022-02-19 15:12:31 +01:00 • committed by Wim Taymans
parent 1e99551233
commit e2287f35db
1 changed files with 4 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
spa/plugins/support/loop.c
View file

@ -98,7 +98,6 @@ struct source_impl {
struct impl *impl; struct impl *impl;
struct spa_list link; struct spa_list link;
bool close;
union { union {
spa_source_io_func_t io; spa_source_io_func_t io;
spa_source_idle_func_t idle; spa_source_idle_func_t idle;
@ -106,8 +105,11 @@ struct source_impl {
spa_source_timer_func_t timer; spa_source_timer_func_t timer;
spa_source_signal_func_t signal; spa_source_signal_func_t signal;
} func; } func;
bool enabled;
struct spa_source *fallback; struct spa_source *fallback;
bool close;
bool enabled;
}; };
/** \endcond */ /** \endcond */