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mm/damon/vaddr: support DAMON-based Operation Schemes

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This makes DAMON's default primitives for virtual address spaces to
support DAMON-based Operation Schemes (DAMOS) by implementing actions
application functions and registering it to the monitoring context.  The
implementation simply links 'madvise()' for related DAMOS actions.  That
is, 'madvise(MADV_WILLNEED)' is called for 'WILLNEED' DAMOS action and
similar for other actions ('COLD', 'PAGEOUT', 'HUGEPAGE', 'NOHUGEPAGE').

So, the kernel space DAMON users can now use the DAMON-based
optimizations with only small amount of code.

Link: https://lkml.kernel.org/r/20211001125604.29660-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rienjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leonard Foerster <foersleo@amazon.de>
Cc: Marco Elver <elver@google.com>
Cc: Markus Boehme <markubo@amazon.de>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
SeongJae Park 2021-11-05 13:46:25 -07:00 committed by Linus Torvalds
parent 1f366e421c
commit 6dea8add4d
2 changed files with 58 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/damon.h
View file

@ -337,6 +337,8 @@ void damon_va_prepare_access_checks(struct damon_ctx *ctx);
unsigned int damon_va_check_accesses(struct damon_ctx *ctx);
bool damon_va_target_valid(void *t);
void damon_va_cleanup(struct damon_ctx *ctx);
int damon_va_apply_scheme(struct damon_ctx *context, struct damon_target *t,
struct damon_region *r, struct damos *scheme);
void damon_va_set_primitives(struct damon_ctx *ctx);
#endif /* CONFIG_DAMON_VADDR */

56
mm/damon/vaddr.c
View file

@ -7,6 +7,7 @@
#define pr_fmt(fmt) "damon-va: " fmt
#include <asm-generic/mman-common.h>
#include <linux/damon.h>
#include <linux/hugetlb.h>
#include <linux/mm.h>
@ -658,6 +659,60 @@ bool damon_va_target_valid(void *target)
return false;
}
#ifndef CONFIG_ADVISE_SYSCALLS
static int damos_madvise(struct damon_target *target, struct damon_region *r,
int behavior)
{
return -EINVAL;
}
#else
static int damos_madvise(struct damon_target *target, struct damon_region *r,
int behavior)
{
struct mm_struct *mm;
int ret = -ENOMEM;
mm = damon_get_mm(target);
if (!mm)
goto out;
ret = do_madvise(mm, PAGE_ALIGN(r->ar.start),
PAGE_ALIGN(r->ar.end - r->ar.start), behavior);
mmput(mm);
out:
return ret;
}
#endif /* CONFIG_ADVISE_SYSCALLS */
int damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
struct damon_region *r, struct damos *scheme)
{
int madv_action;
switch (scheme->action) {
case DAMOS_WILLNEED:
madv_action = MADV_WILLNEED;
break;
case DAMOS_COLD:
madv_action = MADV_COLD;
break;
case DAMOS_PAGEOUT:
madv_action = MADV_PAGEOUT;
break;
case DAMOS_HUGEPAGE:
madv_action = MADV_HUGEPAGE;
break;
case DAMOS_NOHUGEPAGE:
madv_action = MADV_NOHUGEPAGE;
break;
default:
pr_warn("Wrong action %d\n", scheme->action);
return -EINVAL;
}
return damos_madvise(t, r, madv_action);
}
void damon_va_set_primitives(struct damon_ctx *ctx)
{
ctx->primitive.init = damon_va_init;
@ -667,6 +722,7 @@ void damon_va_set_primitives(struct damon_ctx *ctx)
ctx->primitive.reset_aggregated = NULL;
ctx->primitive.target_valid = damon_va_target_valid;
ctx->primitive.cleanup = NULL;
ctx->primitive.apply_scheme = damon_va_apply_scheme;
}
#include "vaddr-test.h"