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ANDROID: 16K: Emulate cachestat counters

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If emulating a larger page size adjust the cachestat page counters
to match.

Bug: 383389337
Bug: 404958693
Test: atest vts_ltp_test_x86_64:syscalls.cachestat01_64bit#syscalls.cachestat01_64bit
Change-Id: I39581c7dce4b59d48096ede33730cc38dbc0680b
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
This commit is contained in:
Kalesh Singh
2025-04-01 17:50:57 -07:00
committed by Carlos Llamas
parent 0d44e1eb0e
commit 778a447513
2 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/page_size_compat.h
View File

@@ -174,6 +174,20 @@ static inline bool __is_emulated_pagemap_file(struct file *file)
}
#endif
static __always_inline void __adjust_cachestat_counters(struct cachestat *cs)
{
unsigned int nr_sub_pages = __PAGE_SIZE / PAGE_SIZE;
if (nr_sub_pages <= 1)
return;
cs->nr_cache /= nr_sub_pages;
cs->nr_dirty /= nr_sub_pages;
cs->nr_writeback /= nr_sub_pages;
cs->nr_evicted /= nr_sub_pages;
cs->nr_recently_evicted /= nr_sub_pages;
}
#endif /* !__ASSEMBLY__ */
#endif /* __LINUX_PAGE_SIZE_COMPAT_H */

3
mm/filemap.c
View File

@@ -43,6 +43,7 @@
#include <linux/psi.h>
#include <linux/ramfs.h>
#include <linux/page_idle.h>
#include <linux/page_size_compat.h>
#include <linux/migrate.h>
#include <linux/pipe_fs_i.h>
#include <linux/splice.h>
@@ -4447,6 +4448,8 @@ resched:
}
}
rcu_read_unlock();
__adjust_cachestat_counters(cs);
}
/*