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Revert "ANDROID: Track per-process dmabuf PSS"

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Revert submission 3680024

Reason for revert: replacing with a fixed version

Reverted changes: /q/submissionid:3680024

Bug: 430499939
Change-Id: Iabc974ee2bd75a88e8e3b4728dc0f1a58ecfe75c
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2025-07-09 16:52:30 -07:00
parent ad0b76e69f
commit 30cf816a50
3 changed files with 0 additions and 50 deletions
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8
drivers/dma-buf/dma-buf.c
View File

@@ -115,9 +115,6 @@ static void dma_buf_release(struct dentry *dentry)
if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
dma_resv_fini(dmabuf->resv);
if (atomic64_read(&dmabuf->num_unique_refs))
pr_err("destroying dmabuf with non-zero task refs\n");
WARN_ON(!list_empty(&dmabuf->attachments));
module_put(dmabuf->owner);
kfree(dmabuf->name);
@@ -202,8 +199,6 @@ static int new_task_dmabuf_record(struct task_struct *task, struct dma_buf *dmab
rec->refcnt = 1;
list_add(&rec->node, &task->dmabuf_info->dmabufs);
atomic64_inc(&dmabuf->num_unique_refs);
return 0;
}
@@ -281,7 +276,6 @@ void dma_buf_unaccount_task(struct dma_buf *dmabuf, struct task_struct *task)
list_del(&rec->node);
kfree(rec);
task->dmabuf_info->rss -= dmabuf->size;
atomic64_dec(&dmabuf->num_unique_refs);
}
err:
spin_unlock(&task->dmabuf_info->lock);
@@ -857,8 +851,6 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
dmabuf->resv = resv;
}
atomic64_set(&dmabuf->num_unique_refs, 0);
file->private_data = dmabuf;
file->f_path.dentry->d_fsdata = dmabuf;
dmabuf->file = file;

34
fs/proc/base.c
View File

@@ -3397,39 +3397,6 @@ static const struct file_operations proc_dmabuf_rss_hwm_operations = {
.llseek = seq_lseek,
.release = single_release,
};
static int proc_dmabuf_pss_show(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
struct task_dma_buf_record *rec;
u64 pss = 0;
if (!task->dmabuf_info) {
pr_err("%s dmabuf accounting record was not allocated\n", __func__);
return -ENOMEM;
}
if (!(task->flags & PF_KTHREAD)) {
spin_lock(&task->dmabuf_info->lock);
list_for_each_entry(rec, &task->dmabuf_info->dmabufs, node) {
s64 refs = atomic64_read(&rec->dmabuf->num_unique_refs);
if (refs <= 0) {
pr_err("dmabuf has <= refs %lld\n", refs);
continue;
}
pss += rec->dmabuf->size / (size_t)refs;
}
spin_unlock(&task->dmabuf_info->lock);
seq_printf(m, "%llu\n", pss);
} else {
seq_puts(m, "0\n");
}
return 0;
}
#endif
/*
@@ -3558,7 +3525,6 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_DMA_SHARED_BUFFER
ONE("dmabuf_rss", S_IRUGO, proc_dmabuf_rss_show),
REG("dmabuf_rss_hwm", S_IRUGO|S_IWUSR, proc_dmabuf_rss_hwm_operations),
ONE("dmabuf_pss", S_IRUGO, proc_dmabuf_pss_show),
#endif
};

8
include/linux/dma-buf.h
View File

@@ -25,7 +25,6 @@
#include <linux/workqueue.h>
#include <linux/android_kabi.h>
#ifndef __GENKSYMS__
#include <linux/atomic.h>
#include <linux/refcount.h>
#endif
@@ -535,13 +534,6 @@ struct dma_buf {
} *sysfs_entry;
#endif
/**
* @num_unique_refs:
*
* The number of tasks that reference this buffer. For calculating PSS.
*/
atomic64_t num_unique_refs;
ANDROID_KABI_RESERVE(1);
ANDROID_KABI_RESERVE(2);
};