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Add linprocfs support for min_free_kbytes

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This adds linprocfs support for proc/sys/vm/min_free_kbytes which the
free program requires for correct operation. The approach mirrors the
approach used in illumos.

Reviewed by:	imp (mentor), emaste
Approved by:	imp (mentor)
Differential Revision: https://reviews.freebsd.org/D15563
This commit is contained in:
Chuck Tuffli 2018-06-15 15:22:27 +00:00
parent 931e2a1a6e
commit d1fa346fac
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335205
1 changed files with 23 additions and 2 deletions
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25
sys/compat/linprocfs/linprocfs.c
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@ -1302,6 +1302,21 @@ linprocfs_dosem(PFS_FILL_ARGS)
return (0);
}
/*
* Filler function for proc/sys/vm/min_free_kbytes
*
* This mirrors the approach in illumos to return zero for reads. Effectively,
* it says, no memory is kept in reserve for "atomic allocations". This class
* of allocation can be used at times when a thread cannot be suspended.
*/
static int
linprocfs_dominfree(PFS_FILL_ARGS)
{
sbuf_printf(sb, "%d\n", 0);
return (0);
}
/*
* Filler function for proc/scsi/device_info
*/
@ -1562,6 +1577,7 @@ linprocfs_init(PFS_INIT_ARGS)
{
struct pfs_node *root;
struct pfs_node *dir;
struct pfs_node *sys;
root = pi->pi_root;
@ -1643,9 +1659,9 @@ linprocfs_init(PFS_INIT_ARGS)
NULL, NULL, NULL, PFS_RD);
/* /proc/sys/... */
dir = pfs_create_dir(root, "sys", NULL, NULL, NULL, 0);
sys = pfs_create_dir(root, "sys", NULL, NULL, NULL, 0);
/* /proc/sys/kernel/... */
dir = pfs_create_dir(dir, "kernel", NULL, NULL, NULL, 0);
dir = pfs_create_dir(sys, "kernel", NULL, NULL, NULL, 0);
pfs_create_file(dir, "osrelease", &linprocfs_doosrelease,
NULL, NULL, NULL, PFS_RD);
pfs_create_file(dir, "ostype", &linprocfs_doostype,
@ -1664,6 +1680,11 @@ linprocfs_init(PFS_INIT_ARGS)
pfs_create_file(dir, "uuid", &linprocfs_douuid,
NULL, NULL, NULL, PFS_RD);
/* /proc/sys/vm/.... */
dir = pfs_create_dir(sys, "vm", NULL, NULL, NULL, 0);
pfs_create_file(dir, "min_free_kbytes", &linprocfs_dominfree,
NULL, NULL, NULL, PFS_RD);
return (0);
}