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scx_flatcg: Make good use of __sync_fetch_and_sub()

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Fetch the value of "delta" directly from the returned value from
__sync_fetch_and_sub, as it returns the origin value of
cgc->cvtime_delta.

Additional fetching instruction of cgc->cvtime_delta would be redundant
here.

Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
This commit is contained in:
I Hsin Cheng 2024-07-04 22:40:10 +08:00
parent a72c9058a3
commit aae826b1b3
1 changed files with 1 additions and 2 deletions
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3
scheds/c/scx_flatcg.bpf.c
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@ -258,8 +258,7 @@ static void cgrp_cap_budget(struct cgv_node *cgv_node, struct fcg_cgrp_ctx *cgc)
* and thus can't be updated and repositioned. Instead, we collect the
* vtime deltas separately and apply it asynchronously here.
*/
delta = cgc->cvtime_delta;
__sync_fetch_and_sub(&cgc->cvtime_delta, delta);
delta = __sync_fetch_and_sub(&cgc->cvtime_delta, cgc->cvtime_delta);
cvtime = cgv_node->cvtime + delta;
/*