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Reclaim unused ithread priorities for user time-sharing threads.

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Leave one band of ithread priorities available below PI_SOFT for
demoted ithreads but reclaim additional ithread priorities for use by
user time-sharing threads.  This is an ABI change in that PZERO moves
up so old ps and top binaries will not format priorities correctly on
newer kernels, but that is a cosmetic rather than functional change.

Reviewed by:	kib, markj
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D35647
This commit is contained in:
John Baldwin 2022-07-14 13:14:58 -07:00
parent 2cf7870864
commit b62848b0c3
1 changed files with 7 additions and 7 deletions
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14
sys/sys/priority.h
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@ -69,10 +69,10 @@
* Priorities range from 0 to 255, but differences of less then 4 (RQ_PPQ)
* are insignificant. Ranges are as follows:
*
* Interrupt threads: 0 - 47
* Realtime user threads: 48 - 79
* Top half kernel threads: 80 - 119
* Time sharing user threads: 120 - 223
* Interrupt threads: 0 - 15
* Realtime user threads: 16 - 47
* Top half kernel threads: 48 - 87
* Time sharing user threads: 88 - 223
* Idle user threads: 224 - 255
*
* XXX If/When the specific interrupt thread and top half thread ranges
@ -100,10 +100,10 @@
#define PI_SOFTCLOCK PI_SOFT
#define PI_SWI(x) PI_SOFT
#define PRI_MIN_REALTIME (48)
#define PRI_MIN_REALTIME (16)
#define PRI_MAX_REALTIME (PRI_MIN_KERN - 1)
#define PRI_MIN_KERN (80)
#define PRI_MIN_KERN (48)
#define PRI_MAX_KERN (PRI_MIN_TIMESHARE - 1)
#define PSWP (PRI_MIN_KERN + 0)
@ -117,7 +117,7 @@
#define PLOCK (PRI_MIN_KERN + 32)
#define PPAUSE (PRI_MIN_KERN + 36)
#define PRI_MIN_TIMESHARE (120)
#define PRI_MIN_TIMESHARE (88)
#define PRI_MAX_TIMESHARE (PRI_MIN_IDLE - 1)
#define PUSER (PRI_MIN_TIMESHARE)