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u3: adds %trim memory-pressure notification "effect"

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This commit is contained in:
Joe Bryan 2019-09-27 10:43:21 -07:00
parent a0cab6c8ed
commit c5ab5c6c5b
2 changed files with 12 additions and 2 deletions
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1
pkg/urbit/include/c/motes.h
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@ -1134,6 +1134,7 @@
# define c3__trel c3_s4('t','r','e','l')
# define c3__trex c3_s4('t','r','e','x')
# define c3__trib c3_s4('t','r','i','b')
# define c3__trim c3_s4('t','r','i','m')
# define c3__trip c3_s4('t','r','i','p')
# define c3__trol c3_s4('t','r','o','l')
# define c3__trop c3_s4('t','r','o','p')

13
pkg/urbit/worker/main.c
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@ -588,21 +588,30 @@ _worker_work_live(c3_d evt_d, u3_noun job)
// XX refactor: we should measure memory after losing the old kernel
//
{
u3_noun pri = u3_none;
c3_w pos_w = u3a_open(u3R);
c3_w low_w = (1 << 27);
c3_w hig_w = (1 << 22);
if ( (pre_w > low_w) && !(pos_w > low_w) ) {
// XX emit low-priority trim event
// XX set flag in u3V so we don't repeat endlessly?
//
rec_o = c3y;
pri = 1;
}
else if ( (pre_w > hig_w) && !(pos_w > hig_w) ) {
// XX emit high-priority trim event
// XX we should probably jam/cue our entire state at this point
//
rec_o = c3y;
pri = 0;
}
// notify daemon of memory pressure via "fake" effect
//
if ( u3_none != pri ) {
u3_noun cad = u3nc(u3nt(u3_blip, c3__arvo, u3_nul),
u3nc(c3__trim, pri));
vir = u3nc(cad, vir);
}
}