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ANDROID: vendor_hook: Add hook in si_swapinfo()

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Provide a vendor hook android_vh_si_swapinf to replace the
process of updating nr_to_be_unused. When the page is swapped
to a specified swap location, nr_to_be_unused should not be
updated. Because the specified swap is regarded as a reserved
extended memory.

Bug: 234214858
Signed-off-by: Bing Han <bing.han@transsion.com>
Change-Id: Ie41caec345658589bf908fb0f96d038d1fba21f3
This commit is contained in:
Bing Han
2022-06-10 19:06:18 +08:00
committed by Treehugger Robot
parent 667f0d71dc
commit ed2b11d639
3 changed files with 7 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View File

@@ -423,4 +423,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_snapshot_refaults);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_account_swap_pages);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_unuse_swap_page);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_init_swap_info_struct);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_si_swapinfo);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_si);

3
include/trace/hooks/mm.h
View File

@@ -191,6 +191,9 @@ DECLARE_HOOK(android_vh_unuse_swap_page,
DECLARE_HOOK(android_vh_init_swap_info_struct,
TP_PROTO(struct swap_info_struct *p, struct plist_head *swap_avail_heads),
TP_ARGS(p, swap_avail_heads));
DECLARE_HOOK(android_vh_si_swapinfo,
TP_PROTO(struct swap_info_struct *si, bool *skip),
TP_ARGS(si, skip));
DECLARE_HOOK(android_vh_alloc_si,
TP_PROTO(struct swap_info_struct **p, bool *skip),
TP_ARGS(p, skip));

4
mm/swapfile.c
View File

@@ -3454,8 +3454,10 @@ void si_swapinfo(struct sysinfo *val)
spin_lock(&swap_lock);
for (type = 0; type < nr_swapfiles; type++) {
struct swap_info_struct *si = swap_info[type];
bool skip = false;
if ((si->flags & SWP_USED) && !(si->flags & SWP_WRITEOK))
trace_android_vh_si_swapinfo(si, &skip);
if (!skip && (si->flags & SWP_USED) && !(si->flags & SWP_WRITEOK))
nr_to_be_unused += si->inuse_pages;
}
val->freeswap = atomic_long_read(&nr_swap_pages) + nr_to_be_unused;