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filedesc: create a dedicated zone for struct filedesc0

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Currently sizeof(struct filedesc0) is 1096 bytes, which means allocations from
malloc use 2048 bytes.

There is no easy way to shrink the structure <= 1024 an it is likely to grow in
the future.
This commit is contained in:
mjg 2014-11-03 04:16:04 +00:00
parent 5c258fe4b9
commit 120816c07f
1 changed files with 5 additions and 2 deletions
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7
sys/kern/kern_descrip.c
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@ -98,6 +98,7 @@ MALLOC_DEFINE(M_FILECAPS, "filecaps", "descriptor capabilities");
MALLOC_DECLARE(M_FADVISE);
static uma_zone_t file_zone;
static uma_zone_t filedesc0_zone;
static int closefp(struct filedesc *fdp, int fd, struct file *fp,
struct thread *td, int holdleaders);
@ -1801,7 +1802,7 @@ fdinit(struct filedesc *fdp)
struct filedesc0 *newfdp0;
struct filedesc *newfdp;
newfdp0 = malloc(sizeof *newfdp0, M_FILEDESC, M_WAITOK | M_ZERO);
newfdp0 = uma_zalloc(filedesc0_zone, M_WAITOK | M_ZERO);
newfdp = &newfdp0->fd_fd;
/* Create the file descriptor table. */
@ -1865,7 +1866,7 @@ fddrop(struct filedesc *fdp)
return;
FILEDESC_LOCK_DESTROY(fdp);
free(fdp, M_FILEDESC);
uma_zfree(filedesc0_zone, fdp);
}
/*
@ -3538,6 +3539,8 @@ filelistinit(void *dummy)
file_zone = uma_zcreate("Files", sizeof(struct file), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
filedesc0_zone = uma_zcreate("filedesc0", sizeof(struct filedesc0),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
mtx_init(&sigio_lock, "sigio lock", NULL, MTX_DEF);
mtx_init(&fdesc_mtx, "fdesc", NULL, MTX_DEF);
}