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docs: cgroup-v1: Update charge-commit section

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Commit 1d8f136a42 ("memcg/hugetlb: remove memcg hugetlb
try-commit-cancel protocol") removed mem_cgroup_commit_charge() and
mem_cgroup_cancel_charge(), but the docs still refer to those functions.
There is no longer any charge cancellation.

Update the docs to match the code.

Signed-off-by: T.J. Mercier <tjmercier@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
T.J. Mercier
2026-04-30 13:11:42 -07:00
committed by Tejun Heo
parent 93618edf75
commit d8769544bd
1 changed files with 2 additions and 4 deletions
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6
Documentation/admin-guide/cgroup-v1/memcg_test.rst
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@@ -47,21 +47,19 @@ Please note that implementation details can be changed.
Called when swp_entry's refcnt goes down to 0. A charge against swap
disappears.
3. charge-commit-cancel
3. charge-commit
=======================
Memcg pages are charged in two steps:
- mem_cgroup_try_charge()
- mem_cgroup_commit_charge() or mem_cgroup_cancel_charge()
- commit_charge()
At try_charge(), there are no flags to say "this page is charged".
at this point, usage += PAGE_SIZE.
At commit(), the page is associated with the memcg.
At cancel(), simply usage -= PAGE_SIZE.
Under below explanation, we assume CONFIG_SWAP=y.
4. Anonymous