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perf/core: Make the mlock accounting simple again 

Commit:

  d44248a413 ("perf/core: Rework memory accounting in perf_mmap()")

does a lot of things to the mlock accounting arithmetics, while the only
thing that actually needed to happen is subtracting the part that is
charged to the mm from the part that is charged to the user, so that the
former isn't charged twice.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Cc: songliubraving@fb.com
Link: https://lkml.kernel.org/r/20191120170640.54123-1-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alexander Shishkin 2019-11-20 19:06:40 +02:00 committed by Ingo Molnar
parent 36b3db03b4
commit c4b7547974
1 changed files with 1 additions and 7 deletions
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8
kernel/events/core.c
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@ -5825,13 +5825,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
user_locked = atomic_long_read(&user->locked_vm) + user_extra;
if (user_locked <= user_lock_limit) {
/* charge all to locked_vm */
} else if (atomic_long_read(&user->locked_vm) >= user_lock_limit) {
/* charge all to pinned_vm */
extra = user_extra;
user_extra = 0;
} else {
if (user_locked > user_lock_limit) {
/*
* charge locked_vm until it hits user_lock_limit;
* charge the rest from pinned_vm