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gm281@boulderdash.cl.cam.ac.uk
bdb25a6156
Implementation of a new scheduler. Based on BVT (Borrowed Virtual Time) but trying to give more fair allocation of CPU for diverse environments (CPU-bound domains running against I/O bound ones). For that reason I called it Fair BVT (or FBVT for short). The BVT implementation gave the basic implementation. This changeset contains also the interface to control the scheduler. Unfortunatelly the contex switch allowance cannot be changed yet (a bug). The parameters introduced in the scheduler are likely to change in near future (after running tests).
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/******************************************************************************
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* xc_fbvtsched.c
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*
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* API for manipulating parameters of the Fair Borrowed Virtual Time scheduler.
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*
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* Copyright (c) 2004, G. Milos
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* Based on K. Fraiser's xc_bvtsched.c
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*/
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#include "xc_private.h"
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int xc_fbvtsched_global_set(int xc_handle,
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unsigned long ctx_allow)
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{
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dom0_op_t op;
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op.cmd = DOM0_SCHEDCTL;
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op.u.schedctl.sched_id = SCHED_FBVT;
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op.u.schedctl.direction = SCHED_INFO_PUT;
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op.u.schedctl.u.fbvt.ctx_allow = ctx_allow;
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return do_dom0_op(xc_handle, &op);
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}
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int xc_fbvtsched_global_get(int xc_handle,
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unsigned long *ctx_allow)
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{
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dom0_op_t op;
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int ret;
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op.cmd = DOM0_SCHEDCTL;
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op.u.schedctl.sched_id = SCHED_FBVT;
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op.u.schedctl.direction = SCHED_INFO_GET;
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ret = do_dom0_op(xc_handle, &op);
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*ctx_allow = op.u.schedctl.u.fbvt.ctx_allow;
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return ret;
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}
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int xc_fbvtsched_domain_set(int xc_handle,
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u32 domid,
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unsigned long mcuadv,
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unsigned long warp,
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unsigned long warpl,
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unsigned long warpu)
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{
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dom0_op_t op;
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struct fbvt_adjdom *fbvtadj = &op.u.adjustdom.u.fbvt;
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op.cmd = DOM0_ADJUSTDOM;
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op.u.adjustdom.domain = (domid_t)domid;
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op.u.adjustdom.sched_id = SCHED_FBVT;
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op.u.adjustdom.direction = SCHED_INFO_PUT;
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fbvtadj->mcu_adv = mcuadv;
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fbvtadj->warp = warp;
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fbvtadj->warpl = warpl;
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fbvtadj->warpu = warpu;
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return do_dom0_op(xc_handle, &op);
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}
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int xc_fbvtsched_domain_get(int xc_handle,
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u32 domid,
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unsigned long *mcuadv,
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unsigned long *warp,
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unsigned long *warpl,
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unsigned long *warpu)
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{
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dom0_op_t op;
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int ret;
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struct fbvt_adjdom *adjptr = &op.u.adjustdom.u.fbvt;
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op.cmd = DOM0_ADJUSTDOM;
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op.u.adjustdom.domain = (domid_t)domid;
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op.u.adjustdom.sched_id = SCHED_FBVT;
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op.u.adjustdom.direction = SCHED_INFO_GET;
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ret = do_dom0_op(xc_handle, &op);
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*mcuadv = adjptr->mcu_adv;
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*warp = adjptr->warp;
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*warpl = adjptr->warpl;
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*warpu = adjptr->warpu;
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return ret;
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}
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