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ANDROID: mm: add vendor hook in fault and read file

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Add a vendor hook to notify vendor module fault and read events.

Bug: 362665923
Bug: 351175506
Change-Id: I4c46e9e00aa5f5555fd42a6b0815563497658b34
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>
(cherry picked from commit a9867d872e24fbe658e05f32b770e4b36c6e3773)
This commit is contained in:
Sooyong Suk
2024-07-18 11:15:27 +09:00
committed by Todd Kjos
parent 814dd5bfa8
commit eda4e9fa64
4 changed files with 20 additions and 0 deletions
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3
drivers/android/vendor_hooks.c
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@@ -447,3 +447,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_swapmem_gather_add_bypass);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_swapmem_gather_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_oom_swapmem_gather_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_oom_swapmem_gather_finish);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_read_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_filemap_read);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_filemap_map_pages);

10
include/trace/hooks/mm.h
View File

@@ -261,6 +261,16 @@ DECLARE_HOOK(android_vh_oom_swapmem_gather_init,
DECLARE_HOOK(android_vh_oom_swapmem_gather_finish,
TP_PROTO(struct mm_struct *mm),
TP_ARGS(mm));
DECLARE_HOOK(android_vh_do_read_fault,
TP_PROTO(struct vm_fault *vmf, unsigned long fault_around_bytes),
TP_ARGS(vmf, fault_around_bytes));
DECLARE_HOOK(android_vh_filemap_read,
TP_PROTO(struct file *file, loff_t pos, size_t size),
TP_ARGS(file, pos, size));
DECLARE_HOOK(android_vh_filemap_map_pages,
TP_PROTO(struct file *file, pgoff_t first_pgoff,
pgoff_t last_pgoff, vm_fault_t ret),
TP_ARGS(file, first_pgoff, last_pgoff, ret));
#endif /* _TRACE_HOOK_MM_H */
/* This part must be outside protection */

5
mm/filemap.c
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@@ -2736,6 +2736,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
iov_iter_truncate(iter, inode->i_sb->s_maxbytes);
folio_batch_init(&fbatch);
trace_android_vh_filemap_read(filp, iocb->ki_pos, iov_iter_count(iter));
do {
cond_resched();
@@ -3438,11 +3439,13 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf,
struct page *page;
unsigned int mmap_miss = READ_ONCE(file->f_ra.mmap_miss);
vm_fault_t ret = 0;
pgoff_t first_pgoff = 0;
rcu_read_lock();
folio = first_map_page(mapping, &xas, end_pgoff);
if (!folio)
goto out;
first_pgoff = xas.xa_index;
if (filemap_map_pmd(vmf, &folio->page)) {
ret = VM_FAULT_NOPAGE;
@@ -3498,6 +3501,8 @@ unlock:
out:
rcu_read_unlock();
WRITE_ONCE(file->f_ra.mmap_miss, mmap_miss);
trace_android_vh_filemap_map_pages(file, first_pgoff, last_pgoff, ret);
return ret;
}
EXPORT_SYMBOL(filemap_map_pages);

2
mm/memory.c
View File

@@ -4690,6 +4690,8 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
ret = do_fault_around(vmf);
if (ret)
return ret;
} else {
trace_android_vh_do_read_fault(vmf, fault_around_bytes);
}
ret = vmf_can_call_fault(vmf);