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ANDROID: vendor_hooks: add hooks to modify pageflags

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These hooks are designed to set or clear OEM reserved pageflags when the
memory state may change.

Bug: 336964184

Change-Id: I9cb288ef6eef7a719d4f4748d6b71010645b7d50
Signed-off-by: Xiaofeng Yuan <yuanxiaofeng@vivo.com>
This commit is contained in:
Xiaofeng Yuan
2024-06-25 19:56:31 +08:00
committed by Treehugger Robot
parent 85a0c4bef6
commit 88b8a0c173
5 changed files with 32 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/android/vendor_hooks.c
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@@ -421,6 +421,11 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_read_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_queue_request_and_unlock);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_fuse_request_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_read_trylock_failed);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shmem_swapin_folio);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_wp_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_swap_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_anonymous_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_uprobes_replace_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_percpu_rwsem_down_read);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_percpu_rwsem_up_write);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_percpu_rwsem_wait_complete);

16
include/trace/hooks/mm.h
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@@ -224,6 +224,22 @@ DECLARE_HOOK(android_vh_kmalloc_large_alloced,
DECLARE_HOOK(android_vh_tune_fault_around_bytes,
TP_PROTO(unsigned long *fault_around_bytes),
TP_ARGS(fault_around_bytes));
DECLARE_HOOK(android_vh_do_anonymous_page,
TP_PROTO(struct vm_area_struct *vma, struct page *page),
TP_ARGS(vma, page));
DECLARE_HOOK(android_vh_do_swap_page,
TP_PROTO(struct folio *folio, pte_t *pte, struct vm_fault *vmf,
swp_entry_t entry),
TP_ARGS(folio, pte, vmf, entry));
DECLARE_HOOK(android_vh_do_wp_page,
TP_PROTO(struct folio *folio),
TP_ARGS(folio));
DECLARE_HOOK(android_vh_uprobes_replace_page,
TP_PROTO(struct folio *new_folio, struct folio *old_folio),
TP_ARGS(new_folio, old_folio));
DECLARE_HOOK(android_vh_shmem_swapin_folio,
TP_PROTO(struct folio *folio),
TP_ARGS(folio));
#endif /* _TRACE_HOOK_MM_H */
/* This part must be outside protection */

4
kernel/events/uprobes.c
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@@ -30,6 +30,9 @@
#include <linux/uprobes.h>
#undef CREATE_TRACE_POINTS
#include <trace/hooks/mm.h>
#define UINSNS_PER_PAGE (PAGE_SIZE/UPROBE_XOL_SLOT_BYTES)
#define MAX_UPROBE_XOL_SLOTS UINSNS_PER_PAGE
@@ -184,6 +187,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
folio_get(new_folio);
page_add_new_anon_rmap(new_page, vma, addr);
folio_add_lru_vma(new_folio, vma);
trace_android_vh_uprobes_replace_page(new_folio, old_folio);
} else
/* no new page, just dec_mm_counter for old_page */
dec_mm_counter(mm, MM_ANONPAGES);

6
mm/memory.c
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@@ -82,6 +82,9 @@
#include <trace/events/kmem.h>
#undef CREATE_TRACE_POINTS
#include <trace/hooks/mm.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
@@ -3494,6 +3497,7 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf)
* not dirty accountable.
*/
folio = page_folio(vmf->page);
trace_android_vh_do_wp_page(folio);
if (folio_test_anon(folio)) {
/*
* If the page is exclusive to this process we must reuse the
@@ -4077,6 +4081,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
dec_mm_counter_fast(vma->vm_mm, MM_SWAPENTS);
pte = mk_pte(page, vma->vm_page_prot);
trace_android_vh_do_swap_page(folio, &pte, vmf, entry);
/*
* Same logic as in do_wp_page(); however, optimize for pages that are
@@ -4232,6 +4237,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
*/
__SetPageUptodate(page);
trace_android_vh_do_anonymous_page(vma, page);
entry = mk_pte(page, vma->vm_page_prot);
entry = pte_sw_mkyoung(entry);
if (vma->vm_flags & VM_WRITE)

1
mm/shmem.c
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@@ -1792,6 +1792,7 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
/* We have to do this with folio locked to prevent races */
folio_lock(folio);
trace_android_vh_shmem_swapin_folio(folio);
if (!folio_test_swapcache(folio) ||
folio_swap_entry(folio).val != swap.val ||
!shmem_confirm_swap(mapping, index, swap)) {